There is no paint on the Hemi SS Darts other than the gloss black the entire front, floor, trunk, and door pillars were painted. The only gray primer on the car was the quarters, rockers, doors, roof, and trunk lid.
I put my money here...
The entire chassis was in gray primer to start with. Engine compartment, door pillars and trunk was painted black. Not floor.
Radiator support and under front bumper was also gray since engine comp. was painted when car had been assembled.
Front clip of the Barracuda was in gray. Undercarriage and wheel wells was left in gray.
I must correct my self here.
Mopar usually don´t have chassis, so body is the word I think.
Than a verification is always desirable. I don´t think I should post others photos even if it´s from old car magazines, but this showing overspray on front clip when engine compartment was painted, is already out on the net.
This means radiator support is mostly in gray, since covered by grill and stuff, except for some over spray on upper part close to the top profile.