What is the length of the water inlet bolt on the side of the block and does it use a washer on my 23?
7/16 x 1-1/2" no washer
Bob's makes the correct bolts for that application. Here is a link to the thread where he introduced them.
What Bob, and others need to learn is, when reproducing a part, it needs to be made exactly like Ford made it, and quit cutting corners to please the street rod people.