I assume that you are not going to run this on pump gas, with that in mind here is what I would do.
Comp package AFR 210cc heads
Use a cam similar to the one you have but with around a 114 lsa
run a procharger @ around 20-25 lbs of boost with a large Air to Air intercooler that matches your combo (unless you dont mind hasseling with an air to water) if you ran around 9:1 compression this motor would get you a pretty easy 1100-1300 hp. If you wanted to get more radical, you could get more out of it. The only caution I would have would be running a stock block, I have heard of people cracking the cylinders running alot of boost on a stock block. You would be looking at the $6000 for the supercharger and another $2000 For the heads. If you decided to go with an aftermarket block, that would be around $2000 also. Pistons should be around $650.