Mopar had that style of magnesium single 4150 carb intakes on the 1964 and 1965 race Hemi 410 HP for NASCAR racing scope
A friend of mine ended up with two of them and was planning on racing a 1964 Plymouth Savoy in NHRA stock but he never got it finish, I don't think he could find the correct carb whineyshruggy

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)