I think it would be a nice addition to the game to have flathead engines. Especially since the game starts in the early 40’s (a lot of American automobile manufacturers used flathead type engines). I own a '52 Ford with a 239 flathead and would like to recreate it in-game. It seems to be more feasible than adding diesels, Wankels, or the like because it is still a form of 4 stroke gasoline engine. Do you think you will get around to adding flathead engines in the base game?
en.wikipedia.org/wiki/Ford_flathead_V8_engine
allpar.com/mopar/flat.html