Interesting thought - that would fit the symptoms of what I'm experiencing. It's almost like a turbo lag without the turbo. There's another post a ways back about carb flow capabilities that made the point about CFM = displacement x max rpm, which in this case is 302/1728 x 3300 = 576, so I could in fact be a little short on carb here. On the other hand, the original carb for the 302 is a Stromberg WW 2 barrel, which has to be less than this and was not associated with this momentary starve after a shift.
