Update. He took the car to the track over the weekend and cracked the stock sleeves at what they estimated was 575WHP. They were running a T3/60-1 at 28lbs and a 75 shot of nitrous. Their guess was the timing was too aggressive but who knows. He is dropping in another stock sleeved, piston/rod LS engine in tomorrow and leave it at 450WHP until he get his new monster block resleeved.