So how should I flush the block/heater core/hoses out once it's back together? I have access to hot water in a hose, so I was thinking I might just turn up the hot water heater to scald and then flush it with plain hot water. Soap seems risky. It's not super nasty since I stopped as soon as I saw the contamination--there's a film of funk in the overflow that I washed out in the sink as best I could, but I don't know how to clean the rest out.
So I got it all apart. When I went to unthread the feed from the glowplug bus, the whole center threaded out of my #1 glow plug. I guess that one probably needs replaced

Probably also explains why the car was harder starting when cold since I was in there last--I'm thinking I must have damaged that guy when I was removing/installing the bus last time. I'm thinking to do all 4 while it's nice and easy.
Cleaned the block up nice and pretty and it is NOT cracked to my eyes, which are pretty good usually. Block also seems acceptably straight.
On the other hand, when I went to loosen those tripe squares, they were a LOT looser than I expect head bolts to be. I won't try to put a number on it, but it was pretty easy to break them loose. I'm confident they went in correctly (used a SnapOn clicker that gets calibrated somewhat regularly). Interesting side note: They're exactly the same length as the hex heads I pulled out of there. I thought gasser bolts were supposed to be shorter???
So I'm ordering an ARP kit and a 3 notch 11mm gasket from Autohaus. Hopefully the weather and the mailman cooperate and I can get the little guy back together soon.
Thanks again.
Luke