I have a brand new 850 Holley professionally built which I was thinking of running. I'm wanting the 496 to be a street engine with as much torque and HP as possible and probably will run a hyd roller cam (size unknown now). As far as heads I was questioning about the best bang for the buck aluminum head wise. The tranny will be a professionally built th400 with the appropriate stall converter, the rearend is a 9" Ford 31 spline 389 gears, and 29" Hoosier Pro Street radials.