I've been playing with the ZZ4 block for a couple of days.
From the numbers (and from looking), I found out it is a standard bore (350) 87-95 four bolt, one piece oil seal, roller cam block.
No crank or rods or pistons, so it'll be a big $$$$ to get it to a 383.
Next up, the 350 flat-tappet, two-piece, four bolt block from Tom. No usable rotating assembly on that one, either. But that looks like it wants to be a mild 350.
One of these days, I'll figure out where to start. At least I have the 062 heads all done that'll work on either build.
For right now, it's clean up the blocks and gather data.