[olddog]

I was originally thinking I would not mess with a 352 block and only considered the 390. However with a little reading it appears that Ford cast the 352 and 390 blocks pretty much from the same cores. They just bored the 390 bigger. So most 352 blocks can be bored to the 390" 4.050" size and more. That was news to me. You can through the 360 truck engines into this too.

Again there were some thicker walled 390 blocks that can go to the 428 bore.