What is the stock carb?

Wow, that's a lot of good of good information. The car belongs to a good friend. It currently has an old Holley on it and has been sitting in a barn for 30 years. The plan is to dig it out and try to get it running. Hopefully the underside isn't too rusty. I'll try to get it running with the Holley and if everything goes well I'll start looking for a 4611SA.

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By the way R4 is Bright Red
Toss a picture of it here.