like i said you do not have the cr i think . SDPC sell a 600+hp crate engine but the cam has 236-244 @0.50 like i said i wound like to see in your engine .this engine has gm rec ports heads fully ported heads and the cr is 10.2-1 there is to many things that differ i can and i have built big block for a long time so at the end of all this is a dyno. not the desk top dyno. i can get a lot more hp but the cr is not rigth to make the hp BUT you have tq .TQ is king and you can make more with 9to 1 at a lower rpm than the hp with your engine . on the sallee SDPC crate engines? piston to wall .the deck hi . rings make? ring gap? how much head work ?what headers do you have? the same they run at the dyno? how about mufflerswhat make? how big how long? on the pipes x or h cross? do you have the same intake and carb that they do at the time of there dyno ? the rigth push rods and this is not done with some cheap $2. checker you get at auto zone get this wrong you could see a loss in power and the same rocker arms they use to .all the thing here can be 10 hp more or less each.and the tune in. and oil pan ? and the oil ?like i said to many variable