Cleaned up the heads and valley pan today under the IM. A little before/after goodness attached. I obviously had a pretty substantial IM gasket leak with all that gunk under there. Valley pan doesn't appear to be leaking, but I'll replace that and do the AGA expandable pipe if it ever does. I also removed the injectors and I bought a cheap little injector cleaner tool set that I'll use to check the spray pattern and clean up the injectors.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
I might be dragging my feet on the valve cover removal (doing the valve stem seals), but I want to limit the amount of time the VC isn't on the engine. One step closer to getting this thing back on the road! It's been a minute!