416 stroker temp?

My 416 stroker has been done and driven now for about 2 years to cruise nights and shows. Today, about 70 degrees now, I took her out for a cruise. She usually runs at about 190 degrees. Sometimes creeps up to 200. But today it starter to go over the 200 up to about 210-215? Very strange. I have a griffin aluminum radiator with the two offset electric fans. I am running evans coolant. I got home and thought maybe the coolant was low. Checked that and the level hot was above the fins about halfway up the top tank. I topped it off with evans and took it for a ride to see if it was that? No change. Next I checked the oil level My pressure on the guage was idling at 25 and goes right to 50, and I am using Mobile 1 5w30 synthetic. It was down one quart, so I topped it off. Going to take her out again when she cools. I checked to be sure both fans were running. So now I am stumped? I have a mopar high flow water pump and I checked the belt that drives it. It seemed good and tight. Now I am thinking that the 160 thermostat which was new maybe is not opening all the way due to not driving it every day? I did have the motor dyno tuned last year. I am assuming that was all good. But I wonder about the distributor maybe moving a little to the lean side causing heat?? Also, my guage is an autometer which has the probe in the front of the edlebrock manifold? Could the guage all of a sudden go bad? As I said. The car has been running fine for 2 years and it actually ran fine the last time it was out about a month ago?? Any ideas on how to approach the solving of this issue?? Thanks...