what carb size should i get for my newly rebuilt 351w.The motor is .30 over with flat top pistons,edelbrock performer cam,stock heads,performer intake,I will be putting long tube headers on it.The motor will reside in a 1967 F-250 with 4.56 rear gears,the motor came from a 1977 car.My cruising rpm will be 2500-3000.I am more interested in throttle response than high rpm hp..

 

600CFM will be a good choice. I like the Edelbrock carbs myself.