Hard to say on the power, could be 800 hp with those parts or it could be 900 hp. In my experience with engines like that it comes down to details. Porting the intake is worth 25 to 30 hp, running more rocker ratio and more valve lift is worth some power, Jesel belt drive and belt driven distributor helps out, big oil pan helps the power, correct headers help the power, vacuum pump helps, gas ported pistons help, etc.