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According to this vendor, the adapter needed depends on the manufacturer of the HEI ignition system you are using on your 1968 Camaro:

https://www.thepartsplaceinc.com/product/1968/1968-chevrolet-camaro-tic-toc-tach-gauge-5500-rpm-327-350-gm-6468713/56424

Nothing wrong with your shifting, Badshifter!

Looks like you were running the Z28 at Buttonwillow.  Haven't been to that track, but have visited Willow Springs.  Great fun!

Scott,
Took the 1979 Trans Am with the Checker Motors sub-frame for its bi-annual emissions test.  Passed as usual, but no fun for the technician as the distributor is located at the rear of the engine and you have to be careful removing the vacuum line when checking the advance as the motor gets quite hot back there! - Mark

My 1970 BOSS 302 has a similar 4 blade fixed fan, original shroud & spacer, with the original radiator (rebuilt), and it does not overheat, even when I took the car to the Fabulous Fords Car Show on a day where the temperature hit the 90s.  The Mustang also has Hooker Super Competition headers, which generate more heat under the hood than the stock exhaust manifolds.  As the car is also equipped with a factory oil cooler, it does help keep the engine cooler as Ford found out that during hot temperature testing, BOSS 302s with 4.30 gears recorded oil temperatures over 300 degrees without an oil cooler.

I still believe you need to check your ignition timing.  I checked the advance on my 1979 Trans Am before I went in for emission testing and the advance had moved from the factory specification of 18 degrees at idle to 10 degrees, which would have failed the test.

I would recommend that you check the timing as your 350 engine shouldn't ping.  I believe that the standard thermostat was a 195 degree unit and I wouldn't go lower than a 180 degree thermostat.  215 degree operating temperature is still within the acceptable limits.  What spark plugs are you using as the wrong plugs can cause your engine to run hot.

According to CRG, a 1 inch fan spacer was used for the small block V-8 in 1969 with the fixed 4 blade fan, whether the vehicle had a 2 or 3 core radiator:

https://www.camaros.org/coolingsystems.shtml

As there was only one fan shroud for the small block V-8 in 1969, your set-up looks okay to me. 

Besides checking your ignition timing as previously mentioned, your thermostat could possibly not be functioning properly and not restricting the coolant flow enough for the radiator to cool the fluid.

Check out the photos on the Ex-Bondurant/Guldstrand Dana Chevrolet 1967 Chevrolet Camaro Trans Am Race Car on BAT:

https://bringatrailer.com/listing/1967-chevrolet-camaro-508/

Welcome to CRG!

Previous posting on yenko website on 124377N141739:

https://www.yenko.net/forum/showthread.php?t=171413

Great to see someone working on an original 1969 Z28 that is going to be raced!

Perhaps they ran out of 3-speed Saginaw transmissions for the 350 engine and decided to use the transmission for the 6 cylinder rather than pull the Camaro off the production line.  Of the vehicles I ordered from GM when I was a salaried employee, only my 1985 Corvette was delivered with optional leather seats rather than the standard cloth seats.  When I reported this to GM (the dealer didn't note the error as I was not charged for the option), the reply was "Merry Christmas" as the Corvette was delivered just before the holidays.

I have a 1970 BOSS 302 that was built with the optional Detroit Locker differential, even though it was an extra cost option and did not appear on the Ford invoice.  I found 2 build sheets in the car which showed it was equipped with a Detroit Locker and the original "979A" tag is still on the differential.  Seems that Ford could have run out of Traction-Lok differentials as about 5 other BOSS 302s built in early 1970 had the same situation.

I have to note how well the VIN numbers were stamped on the engine & transmission on this 1969 Camaro.  The operators who performed these tasks were proficient at their job.  We were still paying dealers for warranty repairs at Van Nuys when I started there in 1978 and we were tough when it came to paying out claims.

The clutch assembly for the 6 cylinder & 350 8 cylinder were 10.5" in diameter with a 1-1/8"-10 spline, so the wrong transmission was used when this Camaro was assembled at Norwood. 

According to CRG, the casting number for the Saginaw 3 speed transmission is 3925647 and the ratios you have posted were used for the 6 cylinder engine:

https://www.camaros.org/trans.shtml#m3speed

Photo of a 1969 Camaro space saver spare from the Yenko website:

https://www.yenko.net/forum/showthread.php?p=1172562

Previous posting on CRG about the space saver rim:

https://www.camaros.org/forum/index.php?topic=18387.0

Additional CRG information on the RS option:

https://www.camaros.org/options.shtml