AMC 360, it was in it when we got it and runs like a champ. When we did the bottom of the tub I pulled it apart to fix a T-cover leak and it has an Edelbrock performer cam, a tru-roller and flat top pistons best I can tell. Everything looked incredible fresh so I let it be. I would have really liked an excuse to go Chrysler power but kinda like the AMC power in a Jeep.