Since it has manual choke with plastic linkage and accelerator pump arm I'm 99% sure it is a 0-1850-3 or 4. It is the least expensive Holley 600 universal carb. The biggest problem with these is that it has a very fat idle circuit, they will generally run rich at idle. If you know your way around a Holley, pick up a renew kit or a trick kit, and a new vacuum secondary diaphram and have at it! (An assortment of secondary springs and a quick change kit wouldn't hurt!)
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