Interesting manifold

Looks like a 2×1bbl intake hogged out for a couple of Holley/(Weber) 5220/6520 2bbls., think OMNIRizon, in which case that linkage is oriented properly.
That Al-U-minimum will transfer plenty-O-heat if bolted directly to a factory exh. manny, probably better than the OE iron with the extra transfer pins cast in.