[clampjockey]

i recently swapped out a 350 for a rebuilt 305; the engine builder told me if i had any problems getting it to run right after the swap to change the cpu chip before calling him. he said problems were more likely to occur going from a 305 to a 350 (like you did) because they don't allow enough fuel thru. he said it always seems to be just stock chips that act up and that if you buy an aftermarket one it doesn't matter if you get one for a 305 or 350. either should work.