I use the NAPA 180* T-stat and have had it in there since I got my car (put it in with a new radiator) and I have had no problem. When I got the car it had no t-stat and it ran pretty hot in traffic. Real hot.
stopped by the parts store today and picked up the only Mr. Gasket thermostat they had--a universal, it seems, that was in the "performance" section. it says something like "Mr. Gasket Performance Thermostat, FORD/CHEVY/DODGE"... forgot it in the car, so i don't have a part #, but i think it's MRG-4364. anyhow, it's copper/brass and is rated at 180*.
anyone running one of these? is there a specific mr. gasket thermostat for our cars?