360 LA squeel / scraping noise like drive belt on passenger side

if it's dropping oil press once hot then you've got a tolerance opening up once it's hot. the where that tolerance is... finding that is the trick.

without removing the engine you could drop the pan and check the pump. you can check the intermediate shaft (pump drive) in-situ before heading that direction.

but to me: low oil press + screeching sound says lack of oil on critical bearings. so you'll likely be pulling the motor anyway...