I saw tracy perf too, looks like its a list of intakes they have for sale and their date codes. Makes nice for numbers restos.
I used Chevy By the Numbers to get the info on the #261 and thought of nastyz28, but could not for the life of me remember the name last night.
I have a random one no one has ever identified. Its an early sixties based on the old style carb flange and runner design but its aluminum with tapped holes in the runners. Best guess anyone has had is that it is a Chevy test intake from the developement labs.
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