I'm currently researching what would be needed to put a 460 cubic inch engine in my 69 fastback. I don't have much experience with engine work, so any help is appreciated. Is a 460 block better than a 429 block? I've heard that they're basically the same block, but that the crankshafts are different (obviously more displacement in the 460). Also, I've read that 429 heads will work on a 460 block. Any truth to that? Finally, would there be any cutting of the shock towers or any other modifications to the engine bay in order to fit said engine? I'm sure these questions have been asked before, and I'm also sure I sound like an idiot asking them. Thanks everyone.