stat gasket

Snake,
Yes, the stock thermostat housing has a releif in it for the thermostat. If you're using a stock housing, install the thermostat in the housing first, then install (use sealant here) the gasket onto the housing. Once it's dry enough to stay together, install it on the intake manifold with a little more sealant.
I would also recommend sanding the aluminum housing on a piece of sandpaper laid flat on a bench to eliminate any warpage of the stock thermostat housing.

George