Pat, I think Im gonna pick up a 427 tall deck from my friend. I have the itch to do a bigger stroker engine. So, I will be picking your brain to find out what will work for the different combos. I figure I have 3 or 4 sets of GM heads, lots of cams, and other things I can use. What does a 565 need for bore and stroke? That sounds like a nice number!! John