I got 613 hp and 625tq using TF240 heads and a solid cam on a 451. 10.75 comp with hooker headers that needed 1 pipe slightly bent. It made 13" vacuum and was extremely easy to drive. I would recommend what Andy did a 470 would be even better. The motor revs quickly as well. The best thing is to get a light piston like a ross like I did and good rods. Good luck
