simple install : drain your coolant , remove upper radiator hose and upper water pump hose , remove two bolts that hold on thermostat housing - these can be tricky but be patient and you can get an open end wrench in there . It would be easier to loosen your distributor and turn it towards the passenger side as the TFI module will be in your way . remove the housing , remove the thermostat , scrape all the old gasket material from both surfaces , install the new stat and gasket using about a 1/8 bead of rtv on the gasket (allow the rtv to cure for about 3-4 min before installing) . Remember the spring end of the stat faces the intake . put all your hoses back and top off with coolant then start it up and check for leaks .
I used a 180* stat from NAPA , stainless steel - nice piece .