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

Could have been engine was assembled machined correctly but some crud hung up in oil passage starved those bearings.

When I built my engine I put crank in block, no rods, blocked oil passages to heads, with oil in oil pan ran the oil pump with a drill. Dropped pan down and metal shavings in the pan. If I would have just slapped engine together crud would have likely clogged oil passages spun bearings.