Oil filter element was nearly glitter free. Looks like Head/Intake project is a go. Apparently running a leaky HG for a few years doesn't always destroy engine. Coolant does contaminate oil post radiator pressure testing. I've heard coolant will destroy bearings but apparently bearings can survive. I found no coolant in filter though. Oil was a pretty ebony black
Maybe coolant leaked into cylinder during radiator pressure testing then leaked past piston rings over night. Maybe coolant is burned up in cylinder instead of contaminating oil. If oil was coolant contaminated maybe it would look milky instead of black?