I wouldn't worry about the Trans too much. I know you have a tr6060, but it's basically the same thing as a t56. Quite a few people out here are putting down 650-700rwtq to a stock internal tranny and they're still holding up in a 3500lb car. Obviously they dont have the stock flywheel or clutch. May have missed it, but doesn't the tr6060 have oil cooling lines? What'd you do with those?