85GTsleeper

625 carter carb is what i use [&:]

67mustang302

I've had a hard time tuning Edel/Carters(same thing). As far as size, those calculators are reasonably close. You tend to need to go just a bit bigger if you have a dual plane, which is why Ford used a 600cfm vac 2nd Holley 4bbl on the 302's in the early 80's. Remember though, if you calculate carburetor size with that calculator, it's figuring best carburetor size for MAXIMUM POWER AT MAXIMUM RPM and not anything else.Try to avoidmech 2nd for the street, vac will run better/get better mileage and throttle response(generally speaking). You're best off, if you want a balance of good power, throttle response, mileage and drivability to calculate the average CFM you'll need across the top rpm range under full power, say from 4,000-6,000. You won't make the best peak horsepower, but you'll make better peak torque(and not necessarily highest peak torque) and have the best average horsepower across the top rpm range, and a slightly smaller carb to get better driveability/mileage. And yes, about 98% of everyone over-carburates their car. There's a guy that lives around here where I live with a 68 Camaro that's a race car with a 355 twin turbo that runs low 7's, if he tunes it right, high 6's with a blow through carburetor making around 1,300-1,500hp at the flywheel, and it's a 600cfm. I'm building a n/a 302 for my Mustang and it's reasonably stout and well built, and I'm going with a 570cfm Street Avenger. Keep a 302 at around 600cfm or less and you'll be way happier on the street in the long run, and if you set the car up right, it should be faster with a slightly smaller carb than what you think it needs(read, close to what the calculators come up with)