I don't know how to add tags, but I can identify the cars. Number 15 is a Shelby Daytona Coupe. Number 3 is a Chaparral 2, either an A, B, or C variant.

Tito66 said:

I don't know how to add tags, but I can identify the cars. Number 15 is a Shelby Daytona Coupe. Number 3 is a Chaparral 2, either an A, B, or C variant.

Chaparral should be the 2A.

Also worth noting the artist is off a year on the title as the two cars shown here ran in the 1965 event, with the #3 being the winner.