shoot for 10.0 to 10.5 to 1, that will give you the torque, J heads are good do a little bowl blend ask the machinest to backcut the valves, and gasket match the heads and intake, use a rpm intake if you don't have one yet, Block the exhaust heat crossover using a thin steel shim behind the gasket on the head side. i would use a cam in the range of 224 to 230 @.050. and a 750 dp holley. that should get you right around 380 to 400 hp.