What Carburetor Fits This Manifold?

I did some poking. Not an Offy Dual-Port (though circle symbol is similar). Appears they didn't modify the plenum. It is cast-iron factory and perhaps ~71 340 (PN 3512100), asking $249 (www.ebay.com/itm/1971-340-4-Barrel-Intake-Manifold-3512100-Mopar-Plymouth-Dodge-/182042150194), or maybe Mopar Performance for W-2 heads only, asking $180 (www.ebay.com/itm/Mopar-Racing-Small...M-4BBL-W-2-Heads-V8-318-340-360-/222045657149). Neither is exactly the same casting, but both are close, and both are rare.