Block out of square

That was a novel, well done on checking it all.
Like was said, they indexed the main bore wrong and decked it off of that screw up.


Now get some sheet metal .046 thick and cut a arch 12" long x 3/8 tall out of it with slots to slip over bolts spaced correctly and just bolt it together loosely..and the drop the arch onto the bolts.

That is... if you cant get them make it right.