wheel stud size rear axle 8 3/4?

Don't forget Right and Left !
Just kidding.
For myself, I found the wheel selection a bit better by having Moser redrill my Kelsey Hayes to the BBP and 1/2" studs up front. I think there maybe enough room, for you, to redrill the rear axles and also the drums. IIRR
I went to different axles and green bearings which leads to different brakes also. IIRR again ! LOL
Ended up going with disc in the rear which leads to changing the Master cyl and proportioning valve which leads to .........