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Bryan - ran across the partial casting number list. Here it is:

While it impossible to totally identify a Rochester B carburetor from the casting numbers, we do have a listing of casting numbers which were used on some of the more common Chevrolet Rochester B carburetors. These castings were machined a variety of ways, and therefore castings (with different machining) will be used on different carburetors (some that are not even Chevrolet). In any event, perhaps this list will help:

Tag 7001374 – bowl casting 7002089 – throttle body casting 7002105
Tag 7002050 – bowl casting 7002046 – throttle body casting 7002128
Tag 7002051 – bowl casting 7002046 – throttle body casting 7002128
Tag 7002539 – bowl casting 7002089 – throttle body casting 7002105
Tag 7002540 – bowl casting 7002089 – throttle body casting 7002105
Tag 7003060 – bowl casting 7002046 – throttle body casting 7002128
Tag 7003526 – bowl casting 7003536 – throttle body casting 7003538
Tag 7003863 – bowl casting 7003913 – throttle body casting 7002105
Tag 7003864 – bowl casting 7003912 – throttle body casting 7002128
Tag 7003986 – bowl casting 7004497 – throttle body casting 7002128
Tag 7004039 – bowl casting 7003913 – throttle body casting 7002105
Tag 7004468 – bowl casting 7004497 – throttle body casting 4468
Tag 7004475 – bowl casting 7004516 – throttle body casting 7002105
Tag 7004476 – bowl casting 7004497 – throttle body casting 7002128
Tag 7004478 – bowl casting 7004497 – throttle body casting 4478
Tag 7004495 – bowl casting 7004497 – throttle body casting 7002128
Tag 7004600 – bowl casting 7004516 – throttle body casting 7002105
Tag 7004915 – bowl casting 7004497 – throttle body casting 4915
Tag 7005060 – bowl casting 7004516 – throttle body casting 4620
Tag 7005140 – bowl casting 7005604 – throttle body casting 5140
Tag 7005921 – bowl casting 7003536 – throttle body casting 5921
Tag 7005922 – bowl casting 7003536 – throttle body casting 5922

Jon.