tinkerer

I have a 1934 Cadillac 355D V8 I am working on. My current issue is with the Detroit Lubricator Model 51 carb. I have been told that the Model 51 on the V8 is different than the Model 51 on the V12 & V16. Seems odd since they are the same Model Carb. I realize finding parts for the V8 Model 51 carb may be hard and little pricey, but I am wondering if anyone knows where parts for these carbs might be found? Are there any parts dealers or junkyards that might have old Cadillac V8 Detroit Lubricator Model 51 carbs to use for parts or rebuild? Were there ever any other updraft carbs that would work on the Cadillac V8s of the early 30's?