Since you are talking about a dent side you'd be better off asking on fordification.net (I believe) although I'm sure there is someone on here who will know.
""Never shoot a large caliber man with a small caliber bullet."
2017 Ford Raptor
1970 F250 4x4
1948 Willys CJ2A w/ Ford Flathead V-8
1975 Ford Bronco
"Beauty is only skin deep....Ugly is to the bone"
It is more important to understand what you don't know than what you do know,because then you can start to learn..???
"you must deal with the attaboys and the ass chewing s with your head up and looking them in the eyes" T.J.E. aka My Dad
There are only three types of people wolves, sheepdogs, and sheep. What are you?
Roughly 65-75 will be a no questions asked bolt in. The 77.5-79 high pinion open knuckle axles will be the most desirable but they require a new master cylinder, proportioning valve, the pitman arm off of a 76 or 77 truck, and potentially a remount of the drivers side shock tower. The 73 should should be almost identical to your 71 as far as chassis goes