Re: overheating flathead
My '41 is at sea level with very similar engine and radiator combination. It will peg the gauge and stabilize at about 215 on the IR sensor gun idling or slow moving for any length of time on a hot day. The temp goes up some on a long grade, but not pegged. I added a partial fan shroud and a spacer to move the fan closer to the radiator which improved the situation only slightly.
The same engine, pre-rebuild, ran cool under all conditions with a brass/copper radiator. Those aluminum radiators are rated at like 500 hp, but that is at ideal conditions with huge air flow and water flow. Increasing air and/or water flow will improve cooling. Since you are overheating at speed going up a grade, I suspect water flow. Maybe upgrade your water pumps. Also, if there is an air path from the grill over or under the radiator and into the engine compartment, you might want to block that to keep all the ram air going through the radiator.
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