Horrible whining sound under hood

[DancingAvocado]

This is on my 72 C20 I recently got. Last owner said it sat for 12 years. I cleaned the tank and lines, put new belts, charged battery. I got it running, and I have a weird sound.

I think one of the pulleys is bad, but it I never had a bad pulley sound like this before. It was very loud. I can't feel any play on the pulleys by hand.

https://imgur.com/a/tvPV5E1 You may have to click unmute on the video, it does have sound.