So far everything I have bee able to find says that both Carburetor's are 1937-1952 series. The one difference that stands out is the size of the "Spring Loaded needle". The 787SB has a 5/16" needle , while the 964S has a 9/32" needle. I'm sure there are other differences that I have not found. For now I want to do a good cleaning and inspection.

~ Craig
1958 Viking 4400
"The Book of Thor"
Read the story in the DITY
1960 Chevrolet C10
"A Family Heirloom"
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'59 Apache 31, 327 V8 (0.030 over), Muncie M20 4 Speed, GM 10 Bolt Rear... long term project (30 years and counting)

If you don't like driving yourTruck, you won't drive yourTruck..| Living life in the SLOW lane