There also used to be a Ford/SVO water assembly offered for Cle-vor engines running a dry intake manifold- not just for Fontanas. You sometimes still find these on E-Bay. The Fontana was designed to be a robust racing block so thermostats were not often used. And a few owners adapt a Windsor intake which is a wet manifold that has a built-in thermostat housing.
I intermittently publish a Fontana newsletter with facts & peculiarities in it. Send me a PM & I;'ll add you to the group. There are currently 25 Pantera owners and twice that many Mustangers running Fontanas on the street.
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