One of my friends has a 429 cj oe 4 bolt main block that looks like it has the stock bore. It is very rusted and may or may not be repairable. The pistons are froze in the block. He deals with hard to find BBF parts for a living. He called me on this motor to see if I wanted it but I had already gotten a a460 block. So I thought I would give it out to you guys if anyone wanted to take a chance on this block. He wants 250.00 bucks for it and it is located in Morristown, Tn. If you want to ask questions about the block pm me and I will give you his phone number. This is a real good guy and I will vouch for him anytime.