Hello I have a few questions I had a over pressurized coolant system exhaust on the coolant. No coolant in oil big plus. When I pulled the heads off the gaskets looked okay and there was no steam cleaned pistons which has me thrown for a loop all head bolts where tight but 2 of the on the ps head came out dirty like they where covered in oil, soot and grime do you think I could have a cracked block. Or is it most likely a cracked head I have already dropped my heads off at the machine shop and they are mag testing and cleaning them to see if they are cracked. Any ideas on my weird senario?

Ps head off dirty bolt location second one from bottom left

Both heads off