mvh said

The choke pulloff well on the Super Six exhaust manifold is different. To use the choke thermostat for the 2bbl carb, you either need the Super Six exhaust manifold, or you need to cut away the side of the well on the standard 1bbl manifold. Or you can use the electric choke that was on later models. There is a good article at slantsix.org that explains this in detail.

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