Sorry, my error. I meant go for iron heads:
Either World Products Sportsman II or Dart Iron Eagle. Or just get a set of stock L31 Vortec heads (don't know whether you can get an airgap for them) or get some 492 or 186/041-style stock heads and port them out a litte in the bowls. Then go for a STREET cam. I'm sorry, but the cam you have won't be fun at all in a street car. Comp-Cams say it's a drag racing cam, and that's exactly what it is. Comes in at about 3500 RPM, mostly you don't even see that type of RPM in regular street driving. Except when passing maybe. Under 3000 you're going to get virtually no power at all, because of the huge overlap of this cam. It'll kill every head you put onto it except for real racing. Get a shorter one with less lift, or you'll be buying a new valve train every other month
I'm not trying to disillusion you, I just hate to see people giving up because things don't turn out the way they should... And that cam won't turn out the way it should. Also a 3000 Converter is too lose. Go for 2200 for stoplight performance, depending on rear gears. If you have any more questions, feel free to ask, we'll do our best at answering them.

Hope I didn't shock you,
Max

@rhamm1320: please run this test with all other things equal, but other heads, like some Brodix or something. Dial in 220cc, 64cc (C/R should be around 10.3 at least for this cam) and race fuel. Just want to know whether this setup would reach 500 HP or more, the cam should be capable of it, which would be a sure sign that it's not working efficiently in this engine if it "only" produces 400 HP...