Dash Pad Question

So i have a 1970 dodge dart, the dash pad is totally KILLED. the vinyl is flaking off in huge pieces, and the foam got soaked at some point and is completely rotting off of the frame. the frame is still good...will those dash pad covers work if the foam on the pad is trashed? is there a place i can get new foam? Im trying to avoid having to pay like 400$ for a new one from classic indsutries since the "cover/cap" style one is only 100$