225 running a bit warm!!!

With all this expert knowledge, I have to ask "youall" My '64 Dart 225 -auto trans runs right on mark (a on gauge) except those very hotandheavy traffic days. Climbs towards the out of normal on temp gauge and then cools down when a normal drive speed returns. 180 stat, upgraded to more blades on fan, every thing I am pretty sure is clean and flowing. I have repaired the Rad so many times that I want to replace. Any feedback pro or con on a aluminum. Also any off the shelf suggestions. -Dart Ken