It has a 218 flathead out of a '53 Plymouth. I have, and have had, enough musclecars. Having a flathead in this car is fine. I would, however, love to upgrade from a 3-speed manual to a 4- or 5-speed. It'll run 80 all say long as it is. The perfect drive train for it would be the 3.6, 8-speed automatic from my '18 Charger, or maybe a 4.0 out of a Cherokee.