yea im thinkin you probably wanna keep as LITTLE nitrous in that motor as possible!!!your lookin at a 1.125" piston height to wrist pin.ive heard that a 1.250 is really about as low as you wanna go with nitrous.i built a 572 with the 6.7 rod and 4.5 eagle crank and my je flattops had piston pin through oil ring land on piston.my max nitrous intention is about 250-275 shot.
as far as your guesstimation...id say 800 tq@4600 rpm and 850 hp@6000.
im guessing that that cam will be a torque king!strong midrange power but a little limited to 6000-6400 rpms.but with that big arm youll have all the midrange power youll need to bend a stock suspension car into a pretzel unless it has atleast a small cage! good luck and let us know your experiences-russ