More to running numbers than hp numbers, its all about the gearing, correct matched stall converter, matched to your rear tyres, engine is only one thing. Add on goodies can add a lot, Full MSD Digital, electric water pumps, spacers, tunes for E85 or methanol etc can radically change things. I am also installing Caltracs and monoleaf in the rear. My friends engine which is a 393 clevo with small chi heads, hydraulic roller, 75 carb, fully sorted track car runs 10.90, it has 510 at engine, in a sedan running a 4000 stall, 28? tyre and 4?11?s. I am aiming to be quicker, more cubes, bigger solid cam, bigger heads, but with less stall and 3.7 gears and 28? tyre.