Besides the body and tin, everything in the McEwen car was in the Olds, the Mustang and Tempo. Yes a few differences such as wheels but parts interchange.
What would be really cool would be if Atlantis could mold up some new bodies for this chassis. Yes not a 100% accurate but it would be really cool to have a body to work with. Seriously with one new sprue, and the body and tins, this could get you 85% to today's funny cars.