I want to add to this...
Putting a 160 thermostat in will usually make it run hotter (if the rad and fans are inadequate)... This is because the hot engine will keep the thermostat open all the time, circulating the coolant constantly and not allowing it to spend any time in the radiator... Therefore it will not have time to cool down.
This is a very common mistake I've seen made dozens of times.
Make sure the rad is CLEAN inside and of adequate size.
Make sure the fan is pulling enough cfm at idle. If not, change the fan or install a shroud.
Make sure the thermostat is not stuck open. You will see coolant constantly flowing if you look in the rad cap opening if it is.
It is ok to speed the water pump up, but not by much... It doesn't take much to cause cavitation! This puts air bubbles into the system which is no good. It also greatly reduces flow through the system.
Just some things I've come across.
