Buckshot - All the research I've done so far shows the 350 V8 could have been equipped with either a Rochester 2G (2 barrel) or possibly an optional Rochester 4MV (Q-jet)*. The carbs for the Chevy/GMC corporate Big Blocks were the Holley 4150 models (model info taken from a GMC Shop Manual).
* The Rochester 4MV Q-jet is listed in the 1972 Shop and Overhaul Manuals for 350 V8's, but doesn't specify which truck models they were used on.
Below are screen grabs from
GM Partswiki from a 1976 Chevy/GMC Medium Truck Parts Book. In it, the only carb listed for the 1972 350 in the 50/55 Series is the Rochester 2G. The second pic shows the Holley 4 barrel listings for the 366/427 big blocks.
I read in another of
Svcattle's threads that he found and was ordering a 1972 GMC Master Parts Book specific to his truck. Perhaps he can check in there and provide more info on what carbs are listed for his 350, as well as confirm what he has currently installed on his truck?
PS - The other pics are from a 1972 GMC Truck Dealer handout showing the engine options. No mention of the carbs that go with the engines.
