Atta Cruising speed that produces 2400 to 2800rpm, the timing will want to be in the window of 46 to 56 degrees.
The trans should have it's own cooler.
Good luck with the electric fans.
BTW
the thermostat sets the minimum temperature; if you take it out for testing purposes, swap in a restrictor washer or a gutted old stat, to prevent erroneous temperature readings.
While in park and idling;
the rad needs to drop the temperature about 25/30*F from tank to tank. If she can't do it with the fans running top speed and the stat removed for testing, IMA suspecting the fans, or the fan-system.
