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Picked up the int/exh manifolds. I needed to remove the carb studs to install the primer needle valve on the inside edge of the intake. The nozzle has a Tee that wouldn't swing clear of the stud. The stud intake side is a coarse thread, then a small shoulder, then a fine thread for the carb nuts. Is this a standard stud available locally or a special gizmo?

It's a "standard gizmo" that should be available at any decent parts store or the parts department at your nearest auto dealership.

Carb side measures 3/8 x 24 and the manifold is 3/8 x 16. I'll see if NAPA has something close unless someone has another source?

Got them right off the shelf at NAPA.

I figured you'd be able to get 'em at NAPA. Nice to be able to do that, isn't it?