Help with Slant 6 oddity identification

Gentlemen you are correct. I used the wrong terminology. There is about .020 spacing difference between a couple of the holes. The aftermarket SFI flexplate I got from A&A doesn't fit as they are much more staggered. Rick Alison advised that if I had the one that looks even there is not an aftermarket SFI plate for it.

However - I don't mind making some mods or using a factory plate for a stock build. its the oddity of no casting numbers on both cranks that strikes me odd.

The industrial block did have a crank but I am not using it as it has the small register and pilot and the trans input shaft and front drum have been changed to run the larger register.

my main question is the lack of markings on the cranks and whether they are compatible with the early block since they are both forged