Most Holley's will list part #'s this way..
List(or L) - *****
Example would be the universal 600. List - 1850
I cant remember if OEM holley's listed the #'s like that though.
I would say that going by the numbers, the carb you have would have been from the 67-72 era. I'm not 100% sure on this though... just going by the holley site.
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'71 LWB
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