Small or large

Thank you. I talked to the 2nd owner last night. He said he only changed the studs to make them all standard tighten to the right. It would be odd for the first owner to have changed the bolt patternd but not the studs sometime before 1980-81. The guy I bought it from (2nd) owner feels it is a small pattern, so maybe my measurement was off. I think for now i will use the money to replace the carter.