What is the correct color of the underbody of a 68 hemi super stock A body?

It as my understanding it was grey primer just like other A-bodies built at Hamtramck. Then no undercoating, seam sealer, wheel well blackout/undercoat.

Troy's Hemi Dart he built:

So are the rear wheel houses gray as well, and the same question for the front. Also what color would the front splash shields be.

I am helping and running the restoration on Tom Myl's original Hemi Barracuda.
I talk to Tom a lot on these cars
First of all they here not consistent with the gray and the black paint. Some had more black than others. Not all had black fiberglass fenders
Just my opinion Chrysler wanted you to finish the paint and race it at the track. So I think the correct color would be any color because they were not considered done until race day.

Thanks for the reply, I am watching your posts and anxiously waiting any updates. Can you tell me some things about the hood?
The location for the scoop and the hood pins?
Also the hole in the hood for the scoop did it go right out to the edge of the scoop on the inside?
Thanks so much.
Bob