power wise, or $$ wise? i sure hope its not $$ wise, because your not rebuilding your motor for that, its going to cost you more than that in machine work.i want around 650-685 max..
if you want to do it on the cheap, you can do:
03/04 used cobra crank $250
03/04 used cobra rods $300
CP pistons $700
thats good to about 900HP or so. add a set of Billet I beam rods, and your capable of 1300HP.
but then you also have rings, headstuds, mainstuds, gaskets, machine work.