Feel like I had something similar. I finally replaced my old factory WP pulley with a new aluminum unit from CVF and it fixed it.
If you are using 40+ year old pulleys I would replace those before I starting yanking my water pump.
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1967 Firebird 462 580hp/590ftlbs
1962 Pontiac Catalina Safari Swapped in Turd of an Olds 455
Owner/Creator Catfish Motorsports
https://www.youtube.com/@CatfishMotorsports
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