(continued).....if it is really a P4532908 casting number, then you've got what started out as a 9.200 water block with 340 mains.

Lifter bore angle was generic/enough material cast into it to be machined either way.

It would normally have been machined into either P4876672
or P4876792 Marketing/MP catalog numbers. Those can be Googled pretty easily or start checking MP catalogs. No idea if they even make these anymore but I am guessing probably not...