i agree h beams r cheap on ebay.get the 4340 cheapie like hawks or cat.plenty strong for your application.
forged pistons and no regrets.make sure ring gap is a lil bigger with nitrous.
call comp cams
crankshaft is a what can u afford!cast might be a stretch.see what cnc-motorsports.com has.they always have specials!flatlanderracing is another good one.
vic jr with a plate 150 shot with all else equal should land you in high tens with a lil luck.if you went roller with cam then no prob