My 273 turned out to be a 318...what did I buy?

PRH said
Looks like a factory egr intake to me.
Carb is a 4010/4011 style……might even be a spread-bore.
That could be answered by pulling the air cleaner off.

The proximity of the brake line to the header is a little sketchy imo.

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I know a few people who have made those work well. Had a rep for coming from the factory with metal shavings in the passages. This one must be OK since its been running for the new owner.