Which holley for 340 magnum???

RRR and 70ARR,
Okay, thanks, I've read that before that the 3310 is hard to beat. I'm not sure what the CFM is but will look into that. It seems like there's advantages and disadvantages to just about any carb, can you tell me about any down side, it seems like I read some, so there's my problem, no experience.
Thanks again.