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Unless that Firebird was a special order color, it was most likely Carousel Red.
The first photo B&W includes one of each color from the first 50 X66 coded cars 10 each DY HO LB FG OG. PLUS a Garet Red or Fathom Green Yenko Nova. The one on the truck is a Daytona Yellow X66 - yellow rockers and gill trim. I have wondered aloud in Dave Beem's presence if this may be his car, which is one of the first 10 DY cars plus his was transferred by truck in the winter to Gates, Indiana and his also has yellow rockers, one of the other X66 DY yenkos has black rockers (the yet to be found much photographed drag car)
The first post has a yellow car on the bottom. Looks like a Vega wagon to me.
But there is a reason why there wasn't any hubcaps on those cars. lol