I don't have one apart to check the casting number, but that airhorn looks like one from the 1959/60 389 "E" carb.
These carburetors, with a small increase in the idle jet, and or course different main jetting, work well for the individual wanting tripower, but not wanting to spend the funds for numbers matching.
Have sold a lot of them over the decades.
Jon
__________________
"Good carburetion is fuelish hot air". 
"The most expensive carburetor is the wrong one given to you by your neighbor".
If you truly believe that "one size fits all" try walking a mile in your spouse's shoes!
Owner of The Carburetor Shop, LLC (of Missouri).
Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings.
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