Funny you should suggest that, I've got a 1950 International Farmall tractor parked right next to my 1964 Dart, and I've had the same thought myself heaps of times!
Martin-Senour Paint brand (NAPA keeps them) Farm Equipment spray paint line, International Harvester Red color is a closer match to the red used on '60-'68 Slant-6s (versus the slightly different red used on V8s).