Vintage Holley Twin/Dual Jet Question

Well internets a total waste trying to find these old carb numbers on tags for the Holley's so i bring it here to see if anybody has some old Holley manuals i can reference. Basically just want to know year and application or year range and application.

i included a couple pics of the twin jet below, hopefully someone will be able to steer me in the right direction. funny though, i can id anything carter all the way back to the beginning of time but for holley they cut you off around 1962? what is up with that??


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