340 carburetor selection advice
I'll ask the same question as always.... what's the idle and total timing (all in).
Cam is 230 @ .050, not big at all. Shouldn't have a problem getting a good tune on it, which it may be lacking now.
Low compression, larger cam = plenty of initial timing
An old 3310 with the old emulsions would be fine on that. My 340 with a smaller cam 214/224 and LD340 ran great with a 3310. It's all in the tune up.