Technical SBF 302 Cooling problem

had a similar experience with 65 Mustang 289 all rebuilt with new Champion 3 row radiator. Ran fine down the road but in town would heat stoplight to stoplight. Tried high volume water pump, five blade fan a shroud, made it better but still a problem. Finally pulled my head out of my **** and tested the radiator cap. It let go at 5 lbs. New radiator cap 13 lb, end of problems. check that cap before you waste any more time or money.

 

I vote stock fan off of a a/c car (a/c usually have a bigger diameter fan) and as also stated get the fan blades out of the shroud...

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Those plastic flex fans are ****.
The blades don't flatten out they twist at the root and cause m***ive drag.
It's probably why they explode.

I'll concur that the fan appears to be over shrouded.

A Windsor in the early Falcons was tight as it is. The more horsepower, the more heat.

Quick trick would be to wedge the back of the hood open with spacers. See if the temp gauge stays steady at slow speeds. If so, it's a low speed air flow issue. Hot air can't get out and the engine bay is heat soaking.

Is there an air dam under the rad support? This would promote a low pressure are behind the rad and under the car to help pull hot air down and out from the engine bay.