Red Diamond, of course. Don't know my cornbinders as well as I'd like. A recent issue of the ATHS magazine (Wheels of Time) had an article about an RD450 with a twin carb manifold and efi.

IMO, wot's best is wot you gots.

77 F250 400m C6 3.54, it was Dad's
81 F250 4wd 300six t18 3.54