Overheating problem

[mrnapolean1]

Clutch fans can be a bit weak.
If it was me i would be looking into a thermo fan for sure.
But it could be possible you have a water pump on its way out however when you got the engine built and flushed it should have been checked and possibly replaced on rebuild.
A clutch fan will not run fast if your at low speed and at high load where a thermo would run well.
This may well be the problem i think. Loading it up and the clutch fan cant spin quick enough because of low speeds.
Get rid of the clutch job and put a thermo in mate.

Water pump was replaced when the motor was rebuilt. and the Thermostat has been replaced recently. So this leads me to it being the clutch fan.
I wish Ford made a Direct bolt on fan for this motor.