i would say it depends on if your trying to make your car stock ? if not i would go with the 4 barrel smaller primary = better gas mileage like u said . And better performance . As long as u keep your foot out of it . but it is realy up too u as u are the owner of the car an no one else is .
5150 4cars = carzy4cars my car= 68 firebird 350 jim butlers ported heads an intake , 4 speed , 3:73s
