Wheel studs issue?

All A-body 8 3/4's were small bolt pattern.

When the disk cars went BBP in '73 they went to 8.25's, and all 8.25's were BBP. So the SBP 73+ cars all had 7.25's. The 7.25's on the other hand were available in either SBP or BBP. The /6 cars that had the option of front disks were BBP, but typically had 7.25" rear ends, which were BBP.