Hard to say,you have a large cubic inch motor,small cam,& large tube header, & a good head.I think it will be out of steam early.Peak H.P. will prob. be around 5500rpm.Large tube header will hurt torque, but the cam u have will prob.make up for it.Just from what I have seen & read Ill say around 760 hp.740 tq. thats just my guess. I have a 588 with 12 to 1,mopar heads that flow 412 @ .800 & really good #'s lower.Racer brown solid roller 760 intake 740 ex.284 @.50,stage 5 inline 2 fours,800 cfm afb's,& 2&1/8 tti headers.I made 836 @ 6700, 730tq @ 5200.