'68 Barracuda carpet pad/glue removal tips

They make a product that dissolves the glue so you can rub it off. I think GOO-GONE or Graffiti remover will work well, (non-toxic I think also) you just have to work at it a little. I do agree with Murray though. If it doesn't smell, leave it. If you want to re-paint the floor though, yeah, I would remove all of it. I looks like a really solid floor pan too, not like what you would find here in the "Rust Belt"