All 79-85 cars and 86-93 four cylinder cars have 7.5 rear ends.
86-93 V8 cars have the 8.8
86-93 V8 cars have the 8.8
Yes I have and I will again.. If you need help they are there.... Good people.
Check out their website... Quickperformance.com
There's something familiar about that beard....
I transplanted a Fox 8.8 into my 68 a few years back after I kind of broke my 8 inch. Fox body rears are ~59.25" wide if I recall, putting each wheel 1.25" closer to the quarter panel given your dimensions. Not sure if the Falcon even has that much clearance, but if stance is important to the original recipe you want, it'll show. You can always shorten the tubes & get shorter axles, but that's a whole extra can of worms to crack open. Aside from that the 8.8 is lighter than the 9 inch and offers lower parasitic power loss. With a little grinder action for bracket removal & welding on new perches, it's a fairly painless swap into a vintage platform.
If you narrow it just put 9" ends on it and move on. No more c-clips and all kinds of disc brake options for those ends.
Given the the mostly original + same bolt pattern goal, it's going to require a bit of cutting & aftermarket axles regardless of the donor 8.8 source, unfortunately. Very doable project, just a little more complicated in keeping the original bolt pattern. Any decent machine or driveline shop should be able to drill out the shorter aftermarket axles and existing drums to accommodate new studs in 4x4.5 pattern.
The OP is looking to adapt to a 4-lug & older 4x4.5 bolt pattern. Throws a wrench into the usual simple fixes.
** I missed the "None of these" option, this could probably work.
The drums are drilled for multiple patterns.. Not sure for a 4 lug, but a call to Quick performance would find out..