Stop in for a cup of coffee

So,Fargo saga continues. block is plugged. I mean pounds of black goo. Magnetic black goo.
plug i got to repair leaking one wouldnt quite work. So i hole sawed part of inner ridge off. Expanding rubber plug works.

next is dealing with muck. I filled block with simple green, rad flush and water. Then aerated it. Drained and pulled water pump,and any threaded in part i could get out.
I have been blasting it with compressed air,and water from a refillable fire extinguisher pressured up to 100 psi. Its getting lots out.