4 bolt main
I agree. The casting number shows that if it is a 327 then it is a 2 bolt main the 327 did not appear to come in 4 bolt
302 and 350 showed both. 2 & 4.
I was able to find the casting number on several web sites. the other numbers from the front right are the ones that are confusing. I will take the oil pan off tonight and take a look. I will post a picture. I do appreciate the information you added about the oil pan and the trans.