4 barrel Carb Stromberg 1952 Buick Roadmaster

Hi looking for a rebuildable 4 barrel Stromberg for 1952 320 ( 4 AUV 267 ). I believe it is the same carb as the 53-54 v8 4 barrel. A must have is the start switch on the carb. Would really not like to contaminate the 320 with inferior parts from a V8, but beggars cant.........