I had that problem
In my 78. It really bugged me. My plan was to get a couple Sparco Seats with the lumbar pad/pillow. That fell short when it got totaled. My 76 I was ok, and my 82, the seats were good, but it was too much of a pain squeezing in and out so out cam the stock seats, in went aftermarket seats from Shucks, a smaller steering wheel and increasing the height of the steering column. No back issues with those mods for me.