Is 160 degrees right for 74?

["K M" <symbiotic@hotmail.com>]

I am going through my cooling system and was wondering whether it is 
recommended to use a 160 degree thermostat in a 74 4 speed (360 c.i.d.)?  
FWIW, right now the gauge in the car reads 180-190 under load with about 
an 85 degree ambient. By the way, just how is 2755 going?  Thanks, Kim.