Stop in for a cup of coffee

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81 chevy chassis. Its overheating. Or lets say running hot.
Rad is a new ihc 3 core.
But its quite high,1/3 of fan is below rad, as i bring up rpms it sounds like cavitation.
Theres 6” of dead air above fan as well.
Timing is bang on factory settings,plugs look good so im leaning towards an air flow problem.