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Re: Dumb Question
If the radiator is big (4 core) and clean, Id start looking at airflow and water circulation. My 396 used to get pretty hot while towing until I got rid of the flex fan. Installed a 19" or 21" (can't remember which) 7 blade steel fan, HD fan clutch and a shroud with the fan about half way into the shroud. Hottest I recall it getting was 205 while sitting on the Causeway near Sac on a 116 deg day and towing everything back from Lake Collins.
As far as the headers, I ran some on my '76 CC 4x4 Dually some years back. Did nothing for the engine temp. It DID make the underhood temps unbelievably hot though. I ended up cutting a few vents into the radiator core support to let more air in. That helped.
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