Question about Edelbrock RPM Airgap - thermostat housing leak

Over the years it may be that several mechanics have filed the housing, and the stat recess is no longer deep enough. Resist the urge to double up on the gasket; restore the depth to receive the stat.
I usually install studs in my aluminum intakes. On the top I install those special washers that Mopar used to retain the slanty exhaust manifolds.
I have noticed that my aluminum stat housings warp over the years, so I file them with a bit of a crown between the mounting holes. And that means I get to deepen the stat recess, again