8.75 drums fitting a 7.25

The 10" small bolt pattern drums are all the same, fit wise, some have a flare but that doesn't conflict with anything.

The 10" 8.75 drum will fit if you use the corresponding 10" 7.25 backing plates.
The 7.25 and the 8.75 housing ends use different bolt patterns, plus the 7.25 uses only 4 holes to mount the backing plate.

All V-8 cars with a small bolt pattern 7.25 will work.

This is assuming you are using the small bolt circle (4 inch) axles.

Mark.