We've done all the aligning there is to do, but every time he comes out the hole and tachs it to 6000 and above it slings. No problem what so ever with my 396 set up and I've got a stock pulley set up. He did install a deep groove moroso alternator pulley with a little bit of help. The only other difference that he seems to think is the size of the torque convertors. 3500 stall so it tachs up pretty quick. I guess this could be a issue.