64 Valiant Headliner

I have never done a headliner on an of m early A's, that said, I just cleaned the surface rust and sprayed a good rubberized unrcoat or Bodt Schltz. But I had done many in later B and E bodies decade ago. Never wrinkle free!
Did you have two little wire hooks at the rear window to catch the back bow?? That is where you would start. Pull toward fron. Headliners will always have to been attached also somehw at front and sides. Some cars had little teeth to atch the liner. I always used the best 3M spry glue also. AC god heat gun will help as will setting the liner on the roof of our car on a warm day with lots of sunshine. Wish I was more help/