[Kenth]

What is the original application of the clone carb?

An original 1966 A/T 389 center carb has .030" idle tubes, top idle air bleeds, .046" channel restrictions, .033" channel air bleeds and .057" idle air bypass in the throttle blades.

Many 1959-69 Pontiac 2G´s are close to these specs, but other makes are all over the map, lots of work to make them work properly but it can be done, "the impossible takes just a bit longer".