A Body bolt patterns?

72bluNblu said
If it uses the large upper ball joints and has the SBP then they’re 73+ A-body front drums, the same ones described in the TSB I posted. If they have the 5x4.5” pattern on the front they’re B-body drums.

And hopefully the correct upper control arm/ball joint combo. They could also be off a '70-2 E-body with 10" drums.