First-Gen Hemis came in three sizes, small (Dodge Red Ram), medium (DeSoto Fire Dome) and large (Chrysler Fire Power). The engine pad on the swapped-in Chrysler giant read &ldquo;54,&rdquo; marking it as a 1954 unit with 331 cubic inches. The aluminum single-plane intake and Turbo 350 transmission adapter are both from Hot Heads.