Advice on ‘74 Duster

I uploaded the pics from my PC instead of my phone so they should be easier to see now.
I really like the car, and the video of it running, well it sounds amazing to me, a nice lump to the idle, and that gives me a lump in the front of my pants lol.
SOMEONE, put some money and time into this car...If they did the work themselves they saved allot of money, I think they probably still spent at least 15k in paint and parts. I am going to assume for the moment, if they went to the trouble to drop a 360 in and re-do the trans, and were smart enough to do that, you would and should upgrade the rear end. I can only hope that is the case.

I see some plain jane dusters that some one goosed in a 383 or 440 and the motor looks like it is sitting crooked, and the interior is a mess with a HUGE tach bolted to the dash pad lol, and all their soda bottles all over the floor and their cig packs on the seats and they want 12K or more. It will cost that much to un-do everything they did attempting to make it better.