Dave, the last 470 C.i. bracket motor I made and dyno tested made 720 HP at 7000 RPM( not peaked yet but the customer didn't want to test it any higher ), it was a 440 block bored to 4.380, 3.91 stroke, 7.1 rods with a set of KB Icon flat top pistons with valve reliefs(true 12.8 to 1 comp. ratio) a set of CNC MCH ported B1-BS heads (flowed 350 CFM at .700 lift)with a set of 1.5 Crane extruded aluminum roller tip rocker arms. The cam was a Crane custom grind that had the same lobes on both intake and exhaust, 273 degrees @ .050 with .420 or .430 lobe lift(CRS ). It had a sheet metal tunnel ram with two Holley 750 D.P. set of by Jet industreis in SO CA. The manifold and heads was the highest price parts on that motor and both of them where bought used at a decent price Lots of choices out there IHTH