Welcome to the club!
This sceneriao has been around the block a couple of times. It appears 180 is a good temp, burns off condensation in the oil and makes for a hotter combustion charge than 160*. If you have A/C, you might consider 195 stat and a 22 lb cap.
You should at a minumnum install a 180* thermostat and make sure the radiator cap and hoses are good. Might even add a coolant recovery system.
Everett "OBJECTS IN THE MIRROR APPEAR QUICKLY UPON RAPID DECELERATION"