The impossible to solve overheating problem

The electric fan is a cheap POS your right but it pulls air pretty well. Thats my point though the fan should not make a difference. If I start the engine cold then go out and run constant a constant 50mph straight away it overheats anyway, fan doesnt help at 50 mph.

The radiator is unknown bought second hand so I had my suspicions, but it has worked and the original radiator which has also has worked no longer is enough to keep this pretty mild smallblock cold.
The radiator will not cool at high speeds if air can get around it. I had to seal all the areas around the radiator and use a radiator support to hood seal.
One problem at a time, first check the inlet and outlet.
treblig.