Your doing something we do several times a day. Give us a call @ Texas Speed & we can disucss your build. We've made over 675 flywheel hp with a stock LS3 intake, PRC CNC ported stock heads *way less $ than gmpp* and a TSP rotating assembly setup. We have all the components to do that build or can even cnc machine your block for you!
www.texas-speed.com
cnc head exchange:
http://www.texas-speed.com/p-1388-pr...d-porting.aspx
rotating assembly:
http://www.texas-speed.com/p-1020-ts...-assembly.aspx
For building a complete package its best to talk on the phone so all of your goals can be discussed!
Here's a block being cnc digitized @ TSP. No other LS shop in the country offers this: