Malcolm, The modifications I can see on a quick look include, seal beam headlights, radiator splash shield, and running boards; there maybe others. The red head engine has a high (6 to 1) compression head; the block is the same for all three variations of the motor. Colors of the three participants.........well.......I'm not sure. Chrysler Corp. shown a car at Hilton Head a few years ago," #8" of the race team of Le Mans '28; it was painted yellow.