Terrible Start Up Sound and Oil Issues-Advice Needed (77 440 NYB)

Good Evening Guys,
Since I have owned the car (June 26th, 2020), my 1977 Chrysler New Yorker has had many issues, however, two have persisted through my entire ownership.
1. As you can hear in the YouTube videos linked below when I start up the car, it has this horrible squealing noise. This noise can also be heard when the car is held at a high RPM (By ear I would guess about 3500. I have tried tightening and loosening the belts. The only time this noise went away was when I adjusted...

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