I think like a 750 cfm carb with vacum secondaries would be your best bet. the reasoning behind the vacum secondaries is that you wont be flushing fuel down your motor that it doesnt need. vacum secondaries will also help your gas mileage also
Some say that a 750 is too big for a 350. That is BS.
You will here the carb manufacturers say that the 600 cfm is sufficient. It is if you have a grocery getter. But if you bury the pedal, you need a 750. Been there, done that.
If you still decide to go with a smaller carb, I have my 600 cfm for sale.
A 750 spreadbore vacum secondarys would work fine,but I would go with a 650 vacum secondarys for mainly street driving and a 650 double pumper for strip.
I would have to agree with Tech @ BG. You do understand that is Barry Grant right. I have a feeling he does this for a living, and probably has a pretty good idea.
From experience, I can say that a well tuned 750 DP Holley is hard to beat on the street. If you go with mechanical secondaries, I think the 650 is the best choice. Many will argue that you need more carb, but I believe most people over carb engines.
With the higher stall speed, low compression, and larger intake a smaller mechanical secondary carburetor would generally give better throttle response, and drivability.
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