To everyone with a 68 Camaro and a Powerglide,
Yes, the 68 Chevelle SB heat stove and tube fit a 68 Camaro SB (because the exhaust manifolds are the same shape for both the 327 and 350 engines). The heat stoves and tubes were only installed on Camaros with automatic transmissions, though. The 68 heat stoves and tubes are different than the 69 ones. Nobody is reproducing the 68 ones..., but I've seen reproduced 69 ones.
I won a mint condition 68 heat stove, tube, and small screw on eBay earlier this year for about $35.00 (was I lucky!!) from a guy who said it was from a 68 Chevelle SB with a 2bbl. I have not verified this fact with any Chevelle AIMs or parts manuals, but the parts fit perfectly on my L48 with a 7028212 carb (4bbl), Controlled Combustion System (CCS) air cleaner, and Powerglide. Also, they look exactly like the drawings in section M35 of the 68 Camaro AIM. The tube is semi-gloss black (with 500 degree or higher paint).
Like the other CRG posters with a 68 SB and Powerglide, it was one of several "Holy Grails" for my concourse restoration. The 4 bbl air cleaner with the CCS snorkel and chrome lid was also one (I guess someone swapped it out in the past for an open element air cleaner??). The air cleaner and chrome lid actually fits an NOS A348C air filter.
However, the mother of all "Holy Grails"...and a "showstopper" for my upcoming concourse/Legends...was an NOS Powerglide transmission converter underpan (3831527) for a 168-tooth flexplate and cast iron nose starter (heavy duty 1108338) used only on L48s. It is extremely, extremely rare and incidentally the same underpan used on 427 Corvettes with Powerglides. It is stamped steel and satin black color. I won an NOS one (with original GM parts sticker and part number on it) on eBay for $300 about two months ago...nearly impossible to find even in a poor condition. I felt like I won the lottery when I got it on eBay. The only version usually available on eBay and in aftermarket is a smaller underpan (3924779) for 153-tooth flexplates and aluminum nose starters that won't clear my larger diameter flexplate. Unfortunately, most of the aftermarket ones being sold are chrome (not original) and all are the 153-tooth type. The smaller underpan was used on 6-cyl and 327 blocks with Powerglides because they used a 153-tooth flexplate and an aluminum nose starter.
If anyone wants pictures of any of these parts, just ask me. I also have a restored original 3924779 Powerglide underpan (153-tooth type) for sale, if anyone is interested.
I'm thinking of helping Kurt S update his emissions control CRG Report with pictures of my NOS Controlled Combustion System parts, air cleaner, filter, breather element, CCS brochures, etc. I may even help update the CRG report on transmissions with the pictures of my Powerglide parts.