Yea i bulit mine too, had Ray Spratling check the head got all the Machining done By M&W Performance 40 thou over, full balance, crow cam, triples and all the usual bolt on gear. Even tried a mild port and polish (which took me about 40 hrs) only thing that went wrong was the flexplate bolts had a build up of residue and was loose even the bolt tension was correct. Made a nasty rattle and cost me about a grand to figure that one out so make sure all those threads are cleaned properly.