Correct Thermostat Temp

What temp thermostat are you guys running in your small block 340. Recently my mildly built 340 would run anywhere from 175 on a cool day to 185 on a 85 degree hot day then my water pump went so I replaced it along with a 180 degree thermostat and now my 340 runs constantly at 180 and on a hot/humid day will hit between 195 and 200 in slow moving traffic and when moving afterwards it will drop back down to around 180-185. I was told by another mopar guy that he was running a 160 degree thermostat and never goes higher than 180. I have no clue what my old degree thermostat temp was. So what is your guys opinion on running a 160 thermostat instead of a 180? I dont feel comfortable with it running close to 200. Thanks