I'm SLOWLY putting together a 408 for my Dart, 9.7 to 1 SRP pistons, typical bottom with h-beams and forged crank, X-heads with 2.05/1.625 chevy valves, ported by me, Lunati Voodoo .513/.533 276/284 adv 234/242 @ .050, matching springs, etc. I haven't decided on the rockers, or what material...