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Holley mid mount and Hooker Blackheart turbo manifolds.
The thermostat inlet housing is pointing right at the manifold outlet, hot side.
I think a straight thermostat inlet would be better. An LS housing is smaller, 3" bolt hole, c to c. This is a 3 1/16" c to c. Any ideas what housing this is from or would work here?
Here is the solution out of the box and ready to go. An LS3 Gen 4 thermostat housing from ICT Billet.
Appreciate the ideas but the holes are actually very small, M8. The thermostat is in a molded rubber gasket and I did not want to slot the holes to make an LS1 fit.
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Thermostat housing 
