poly 318 carburetor

I'm working on a 1965 sport fury with a poly 318. I always thought these engines came with stromberg carbs. This one has a Holley carb with a part # R7939 Is this correct for this engine? Does the R on the part number mean it's a remanufactured stromberg? Thanks to anybody who knows.

A Holley R-7939 is a 1962-65 273-318 carburetor, according to the Holley Illustrated Parts & Specifications Manuel.

Thank you

Carter BBD's too.