Chevy changed to the dual servo brakes in 51. All those parts (chevy thru 54, corvette thru 62) hubs, drums, backing plates etc. would be a bolt on for the older chevy. Some of those parts i.e. drums & shoes were used on later chevys but not as a complete unit. On a wheel cylinder if area goes up so does the force it exerts and on that huck style you need all the help you can get. Hope that helps.
Try The Filling Station, Ecklers, Chevys of the 40s even Speedway Motors