Something here...

What some people do to these cars is amazing. At the local Mopar restoration shop he gets these “rebuilt ready to go” deals all the time. Some running, some not. Last one had timing cover glued down...no timing chain. Another had the timing gears off one tooth. Others have completely mismatched combos and/or combos not based on reality.

Most 40-50 year old blocks and heads have accumulated decades of rust and scale. Hot tanks will not get this stuff out. Someone needs to physically pick the rust and scale out.

factory radiator shroud?
Hood to radiator support seal?
Aftermarket pulleys?
Stock type water pump? Housing?

Does the car have loud exhaust, like flowmaster or glass packs? Might make it hard to hear pinging? Verified compression?