I just has a 560 completely rebuilt by a very reputable machine shop in the area. It was put together basically for stock classes. Its a stock kit, head and block have both had fourty thousandths each taken off. The cam was redone to match the engine and he does a very good job making heads flow and this was also done along with new crank and oil pump. He has put two different head gaskets in it and cannot get it to stop leaking. I am perfectly confident with him that the block and head are true, like I said its a very reputable place in my area. The one and only thing that wasn't replaced was the head bolts so I guess thats the next step unless someone can give me a better suggestion. Is there anywhere around other than a dealer to get new head bolts and good quality ones at that? Thanks