383 and 440 main Caps?

Guys I pick up a couple of big blocks the other day. One a 2/1969 cast E383 short block. The other a 10/1972 cast J440 HP.

Both blocks had the main caps removed but I also found a container that had 2 sets of caps plus 2 extras. One of the extra looks like it spun a rod and has quite the lip in it.

Looking at the 2 matching number sets they are identical. Anyway to figure out which set belong with which block?

One set are all stamped 25 the other are stamped 28....

383 and 440 main Caps?
Author: Portsider44