As far as your other parts that you have available for these cars,
How bout, could you look up under the trunk floor, gas tank removed, see the upper support "mounts" for the gas tank, I need particularly the driver side Would you have??? I don't need the whole trunk floor. These are directly in line with where the straps go around the bottom of the tank. I may wind up taking off whats left (drilling out the spot welds) and seeing if maybe a local HVAC place with all the sheet metal brakes, shears, etc they have, can make me something close, if I can't find. These should be the same on '78+, 2 dr or 4 dr but I don't think wagon would be. My car's an '80 2 door.
Also on your F body rear end if it is an 8-1/4, it might be worth more to sell/trade it off for other parts you need. And to most it would definitely be worth more "whole" than being sold as a pile of remnants. (I don't think the lack of drums would be a deal breaker for most though) If you weren't so far away, I'd seriously consider getting it from you myself, as a spare for my Volare.
I have an 8-1/4 here in pieces already, that I need to get put together for that car, now; all new guts except axles; I guess I have to re use those.
(would have used as was, if it had better than a 2.76 gear and a Sure Grip) I pulled it apart to sand blast, paint, and swap gears to 3.55s..