Re: Elderbrock AVS carb
apparently the first three digits are the julian day and the last is the last digit of the year. (guess it's up to you to know the decade).
https://static.summitracing.com/glob...rantyguide.pdf
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 1970 C10 LWB 350SBC, SM330 Muncie (not saginaw SM326) (on tree), 3.07 open (assumed), PS, PB, Idiot lights
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