Holley Carb ID

Anyone know what model Holley this might be? It's a vacuum secondary, only has one removable metering block, idle air adjustment on the primary only. There is no choke and far as I can tell, it never had a choke mechanism. I find that odd because the top of it looks like a race type carb, yet it's vac secondary and single metering block which seems more street oriented. I asked and there are no ID numbers on it.
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