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Welcome to the forum. There were three sizes of radiators made during the era, the others are 22 and 26 inch radiators. The smaller radiator is probably considered a little on the rare side for the 340 but if it works that's what counts, but, any radiator shroud from any of the 18 inch radiators should fit, wether it is the original for 1973 or not may differ, but having the shroud is more important at this point. The OEM radiator listed is for 73-76 A body and 74-76 B body small block cars, which is quite a range of vehicles. Hope this helps a little bit.
