Also came across this carburetor. I think it is a 1969 Shelby 428CJ carb? Trying to confirm what it is and what it might be worth? Thanks.
Google is your friend…
The S2MS-9510-A is a highly coveted, original high-performance carburetor manufactured by Holley for Carroll Shelby. Also known as Holley List 3259 or 3259-1, it is a 715 CFM “LeMans” style carburetor originally equipped on 1965-1967 Shelby GT350s with the 289ci Hi-Po V8 engine. [1, 2, 3, 4]
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Date code 993 would indicate 1969 service carb. Great piece. Tough to sell as a service part, but with originals in the $3500-$7500 range, at least $1k in my opinion.
Thanks for the help Guys!