If you are willing to go to portland, Steve Hanno at Modern Classics is a great guy. Our group dyno's at his shop every Jan. He really is a class act, and I know that a couple of his LS1 builds have been in Super Chevy and some mags.
depending where you live. There's a good one on the east side of Washington. His name is marty he had his twin turbo tpi 87 trans am featured in car craft. http://www.shelleyperformance.com/