Steve my 63 Sport Fury kinda did the same thing as its a 440/493 stroker and when sitting at redlites for a few minutes it would creep up to 200 and then if I sat and idled long enough an hot days it would even creep to 205 which I did not like so after setting everything to proper specs I added this electric pusher fan you can just see in front of the rad and it worked real good. Now if it creeps up at a I lite I turn the electric fan on as I have it on a toggle switch and it brings right down and keeps it around 180. On super hot and humid days it will still hold 185 to 190. It really helped alot at a long idle. Ron