as far as temperature, what thermostat do you have? from a performance standpoint, 160-180 would be best. 195-210 is nothing to worry about. my junk creeps up to that in traffic regularly. i think most modern cars run no cooler than 195 to help emmisions. if you have a fresh motor, it may run cooler after you have a few miles on it. idle speed...800ish in park. the timing and torque convertor will have a big effect on how much it drops in gear.