Hey man was reading about your airflow through the radiator. I deal with cooling problems all the time in Texas and the best system that I have found is an aggressive pitch mechanical fan and a proper fan shroud. It may rob a little horsepower, but it will pull massive amounts of air. Hope this helps.
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1968 F250 longbed 2wd.
Late model 351w c6 trans.
1969 F100 Explorer
360 3spd manual
1967 Fairlane wagon
302 c4 trans