428street Have you checked into blue thunder heads? The other would be the shelby heads. I know my Shelby heads flowwed better than 300cfm out of the box on intake. The other thing is, you are limiting your rpm through heads, cam and exhaust parts. It's better to have the parts in the motor and not use them, then wish you had done it before you built the motor. If you give the specs on the motor you are looking to build, I could give you a rough HP and torque numbers. Need from carb to
oil pan for the specs.
Rick L.