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I take it you couldn't find a MOPAR specific engine builder in your area? Obviously this engine "builder" has zero experience with a Chrysler engine and should not be allowed to go near your engine again.

Cut your losses and find a builder familiar with Chrysler engines

Gus




A builder familiar with Chrysler engines will help but it's no guarantee.
I had similar debris in a new motor after 37 passes. Cam bearings had wiped out, the new ones had been installed by a well known Mopar engine builder.