the cost of just finding a junkyard motor vs. spending time on what you have now would most likely make sense.

It sounds like a toasted bearing, not good.

rjp

__________________
03 540I (GAK!!)
81 280E (W123)
70 LeMans Sport with pissed off Poncho 462"
1989 Silverado Step Side (under the knife- complete restomod)