Here's a close up on the driver - The picture isn't super clear, so this is the best I could do:
Did George run the #24 later?
Also, regarding the A car, Rick is right about the Schenk Ragno team already having a Gremlin. It's actually in the background of the picture with the full shot of the the #55C.
So... that only leaves the big blue Falcon, and the red Pinto(?) in the middle of the pack as unidentified....