Question about Edelbrock RPM Airgap - thermostat housing leak

This is what I'm running.

Mine is clear coated aluminum, but you can get them in different colors. Red, blue, aluminum, black. I think I paid around $80, but it was worth it.

CVR Thermostat Housings

View attachment 1715230646
What thermostat are you using with that housing? I have the same one but a Chrysler style thermostat does not fit it. I might need to use a chevy style, but those have a smaller O.D. And might fit the Chrysler manifold.