To be accurate, what type of block did you start with, how much duration does the cam have, intercooler? etc. It is especially hard to guess without good cam specs and since I don't know very much about it I'll assume. Roughly around 450 hp and 450 torque with the 6-71 which doesn't sound like much. IF I hadn't used the dynosim program I mighta guessed more but it usually doesnt lie and thats what it spit out. With some slight playing around I got it to around 500hp and 500 torque, but thats with cam stuff. Get some more info and I could help ya a little more.