Carbs are actually easier than F.I. and a lot cheaper. A good carb with electric shoke will run in any weather and only costs about $300 plus $150 for the intake. F.I. is $450 for an intake, $150 to $200 for throttle body, plus injectors, MAF, cold air intake and what else. All your parts are like $1000. Then you gotta get the thing tuned and get the chip calibrated. Sounds more complex to me. A carb and intake swap takes me about an hour. Try changing all your fuel components that fast. Anyways. Your wrong about the carb size. A 750 would be too large. Go to any site that computes carb size for your engine size and then look at all the guys running blowthrough applications and its all about the 650. I know a guy running a built 350 with twin turbos. Guess what, 650. CFM is dictated by engine size and RPM, and since he is only running a 331 that wont see past 6500 rpms if he's smart, it doesnt need a 750. Trust me on this one. CFM has nothing to do with fuel, thats in the jets. He wont run lean with a 650, but a 750 will destroy his streetable and low end power. I've already built what he is doing so I know what the scoop is. Please dont pass this poor guy a bum scoop.