225cu in Chrysler slant six on a (four-speed manual) Clark fork-lift transaxle. Mine had a Carter single-barrel side-draft carburetor, same as the '53 Corvette six.
Later models had a 454 Olds. I don't know if it had the same transmission. The non-CV u-joints are a weak link. Crank the wheel and floor the gas and they go Pop!