Hi Rick
sounds like you are going to have some serious HP when you are done. I suggest you check with Stephen Kaspar at Imagine Auto
www.imagineauto.com He's been a great help to me over the last 3 years of my turbo ownership. Practically walked be through the engine tear down. Anyway he's done several twin turbo conversions and a 3.6 tt into a 79. He's known as
PorschePhd@imagineauto.com Tell him John from VA recommended him. Good luck and hopefully we'll see you around this summer with the other turbo guys.