I would have considered new bolts, if not for the fact I keep snapping them. Looks like if I do get the hang of drilling/extracting the bolts, I'll need a few new ones, so yes, I'll probably replace them all. But I need to know which hole takes what kind of bolt. So far looks to only be 2 kinds, so that's a relief.

And on a good note, the fan shroud is infinitely cleaner than it was before. Come visit me when I'm wracked with cancer in 20 years, but 1/4 a can of B-12 Chemtool later, there isn't hardly any grime left on it. I ended up using a putty knife to scrape it off it was so thick.
I also discovered that the top of the overflow and windshield reservoirs pop off, so I was able to get them cleaned up much better. I know that does absolutely nothing to move me toward getting the important stuff fixed, but I wanted something to turn out RIGHT for once.

So now I have all the bolts off, all that's left (unless I'm missing something, and...I probably am) is to separate the pump from the block, clean the surface, yank the broken bolt stud from the thermostat housing, drill out and extract 4 snapped off bolts, buy new bolts, and throw it all back together, hoping one of the 2 was the culprit of my coolant leak!

Believe me...were the last person to have used anti-sieze on the bolts, and none of the snap, crackle, popping happened, this would have only been a 3 day job, and for me, that's pretty good!