were to get a head liner for 74 Duster.

The wife & I did the same thing. We went down to the fabric store (JoAnn's) & picked up some headliner fabric. They had 3 colors. Black & 2 greys. 3M spray glue. Scraped the Dakotas plastic headliner board clean and set it down. Easy to trim.

A good backing is the first key.
4 hands or better is the next.
3M is a strong as heck glue!