Thanks for the quick reply !....I do have that in the factory 1969 "Assembly Instructions" Manual M38-A3 (page 359). I think that's a larger engine. Series 12000.
Were looking at the same Manual but in a different format I suppose i.e. page number's differing, but same material.
The 1969 blue "Motor Manual" show's it going into a front port of the carburator just below the fuel line titled" spark advance & modulator vacuum port".
There is a second heat & vacuum port at the rear of the carburator as well, however, that is not shown.
Has anyone out there actually connected this Modulator Vacuum line to the Carburator with a "T" and hose's?..or, are you running the 2BBL vacuum out of the intake manifold..?
I had been informed the intake manifold 3/8" vacuum port was ONLY for the power brake option...and to provide the needed vacuum to the brakes, otherwise, it was plugged.
I don't have power brakes.
I realize this may be a harder question, as I'm one of the few out there, probably, that still has a factory Norwood application 2BBL on a little standard 307, with no options. I wish to bring it back to factory specs. Most people, I'm informed, build their 69's up with 4 BBL's..totally different.