Paint the real car to match the model?
Maybe buy a roll of auto pin striping tape, lay it out on a piece of glass, trim with exacto knife, and transfer to model. Not as thin as a decal but will give the look you want.
I took pictures of that car when it was BRAND NEW. Greg had just done the paint and it was beautiful.
My buddies and I went to Dragway 42 in very early spring 1970. It was the first day they were open that season, kind of a test-n-tune day. Arlen showed up in his 70 Duster P/S. He made several...