What is this and why would it be there?

Yes it was running and ran well - no coolant in the oil. I found strip tags in the glovebox that were 12.8 runs. The owner ran it with old L60s and full length exhaust.
This motor isn't the numbers matching motor that came with the car. Can anyone suggest a Mopar motor builder in the York, PA area I could have take a look at rebuilding the original?
Johnny, does BP do rebuilds?