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I guess there’s a couple of things you could check in this case to isolate components.
Check the belt grooved side for cracks or glazing, especially check it if you bend the grooved side back and open, there should still be no visible cracks.
you can run power and ground to both electric fans one at a time listen for that noise, maybe they are going bad, just a thought!
Can you consistently get the noise to come and go when power the a/c on and off? powering it on and off could still be caused by either belt or compressor.
you may check these things if you haven’t already.
wish I could think of something more right now! Have fun!is there a check engine light on? you can access codes on GM vehicles pre-96 by using a paper clip on the data link connector located under the dash.
usually they are two adjacent corner terminals and set the key to the on position. Count flashes for the codes, just google some directions for GM OBD I or something.
your fuel pressure seems low in my opinion, you might check out some specs on pressure and volume output for the fuel pump from a parts store just to be sure and consider doing a volume check as well by simply releasing the fuel from a pressure gauge into a container for maybe 30 seconds or less and see what you get.
I hope this helps, I could be completely wrong.
Have fun!