Dude, if you want parts, pm me. I will ship them from overseas. Maybe consider a stroker kit, like HKS, if you've got the cash lying around. Forget about the stock block. Get an N1 block from Nismo, they're 3k a pop.
HKS stroker kits come with pistons, con rods and crank. Put it all in and you should have a decent engine. Head work is the next thing you would look at, get it port and polished to maximise your bottom end. And don't forget about your sump baffle while you're at it.
If you've got about 40-45k lying around, I can get you an 800hp Tomei engine, or a JUN engine built to your specifications.