Hi To All,
Thought i would jump in on this one. When you look at the seats set up for the 1,2,3 Mustangs back in those days, it was very crude and basic. For example, the seat travel forward and backwards did not really cater for tall guys, and as far as going all the way back, still did not provide enough leg room. The seat upright did not have any adjustment to it, which would have made a big difference to overall comfort. Tilt steering helped to some degree, but was not the full answer. Also, the seats did not offer any height or tilt adjustments to them. This would have helped as well to overall driving comfort. Electric/ power seats were available in the Cougar range as options i believe but not for 1,2,3 Mustangs. I don't know if the Cougar power seat tracks offered enough back slide travel, tilt travel, or up and down travel.
In any case, i am not a tall guy, but in my '73 Convertible, i found the back slide travel not enough when fully set back as far as it could go. I got around this problem very successfully by buying a set of seat frame extensions that bolt on easily to my existing seat frame legs. Year one Company in America sells them for a modest price. I installed them and they solved my leg room problem. These track extenders will solve leg room issues mainly, but if you have height or seat upright, tilting forward or backward issues, you may have to upgrade your front seating to more modern seats that offer all these adjustments.
Lastly, a few years ago, i invented and installed a footrest for our 1,2,3 Mustangs. This footrest has provided me with extra driving comfort and control, and has made a world of difference to my overall driving experience. I mentioned it here in this topic, because it may provide help in relation to finding a better seat setup experience. It certainly did for me. Here is a link to my old post on this subject.
https://www.7173mustangs.com/thread-austin-vert-invents-a-footrest-for-71-73-mustangs?highlight=foot+rest
Here is a link to the extension brackets product for sale.
https://www.yearone.com/Product/PartSearchResult/SB246/
Hope that helps.
Greg.