I'm not much help here, FWIW my latest Q-Jet car 03D has a 211 carb dated 052. I'm also guessing your's is borderline between "late" and 3rd type. Since some late production '67 parts carried over to the '68 model year (323 396 blocks in June '67 for example) the 3rd type carbs may be later than you think.
IF..it were my car I would go with a 210 carb.
The one on eBay, located in Eugene OR, seller is likely Chicago Corvette Supply. Al F. moved his operation west a while back. Don't know who his rebuilder might be.
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