The Scotty's Muffler roadster has an Ardun engine. That was a flathead Ford V-8 with OHV heads, designed by Arkus Duntov (Ar Dun), who was the father of the Corvette. The story I heard was that the heads were originally designed for trucks with flathead engines. Hot rodders saw the heads & they were a natural for drag racing. Almost looks like a Hemi, but the plugs are spaced differently. $2 for the history lesson. Grin.