Is this 440 block worth going any further with?

Why? Because I can, blocks are cheap and easy to find, just kidding. To make a 512 out of this block will only require me to go .035", over bore yielding a 4.375" bore, it should still leave plenty of meat in the cylinder walls for future repairs if needed. A 4.250" stroke and 6.535" rod is how I will get to a 512. Sonic check is a given.

Brandon