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

340sFastback said
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.

Yep, you could be correct as well, the engine was rebuilt 15 yrs ago then sat in a garage until we got it. We thought we had it rather clean but we could have missed something. We are just learning this old car, fixing engines and having fun thing. Father and son projects.