383 stroker

Last one I built was a 496 kit from Muscle Motors. Good combo, with a hydraulic cam and through stock manifolds and exhaust it makes about 535hp, 560tq. (448/468 to the tires). It's pump gas (10.1:1 static), uses ported Stealths, and an Air Gap. There was no block clearancing issues even with the wet sump. With a solid flat tappet and headers I think you'll exceed your goals if the heads are good enough. If you're not going to port them, you'll want another .050" lift and another 12-15° of duration @ .050.