Nice combo except for the Team G which kills torque below 4000 ( good hp up top but best suited for a really light car with a lot of stall and deep gears) pro parts headers are good design but primaries are about 4" too long. Team G and the standard length pro parts really are mis match, IMHO.

Hp is gonna depend on head flow, 557 can get it done with good .300-.500 flow numbers. I run a ported Street Dominator or a ported Indy Dual Plane on anything up to ~630 horse and a 1000hp 4150 with anything less than about 4200 stall. Since your running a 4500 the M1 single would make more average torque.