For what it's worth, I've heard good things about Mike at Lewis racing engines as well. Have you considered this as well? -
http://sdparts.com/details/gm-perfor...parts/12498792
Has just about everything you need, but it does not include water pump, carburetor, distributor, intake manifold, or spark plug wires. That way, you can chose your own and make a bit more power. I'm sure there's a warranty behind it as well.
GOOD LUCK!!
