By and large the only difference between cars is the power plant and sheet metal. Pretty much all the other stuff is common use. May be a few clutch/trans combinations that differ too. Personally if they want to save the class they need to look into engines that more closely resemble current offerings and FI with a flat hood so the cars look more in line too. Maybe factory stock type cars, COPO, Cobra Jet, Drag Pak, but with larger displacement and more advanced heads/valve train.