I have ran into this myself and found the later blocks do not have the same gasket off set as the early blocks.
When I built my resto block I had to get a later Plate
The stud is the same. But there are different styles. One that tightens with a wrench. and one that tightens with a 3/8 ratchet.
I have what you need if you need the early plate. I also have either stud. Check which plate you need. and which stud you want. The wrench stud flows more oil due to a round inside hole rather then a square hole for use of a ratchet. Steve