Guys, I found something that may affect your guesses and you can change your minds up until next Thursday.
One cylinder head was a C6AE-R and the other one was a C8AE-H....
Block is a C6ME-A. I don't that doesn't affect anything, but just documenting it. I put the engine on an engine stand today. I'm still not 100% on my back and didn't feel like trying to flip an engine back over, so I looked briefly for crank cast numbers and didn't find any, so I put a screwdriver down the plug hole and measured the stroke. It's indeed 3.5".
The pan only had a hand full of bolts in it, so I went ahead and dropped it. Glad I did, because the pickup bolts were loose. The previous owner had swapped pans and he didn't tighten the pickup bolts. I also quickly put a socket on some rod bolts and didn't find any loose ones.
Oil in the filter looked clean. It had a new rotor, carb looks pretty new. Plugs looked really good. Rolling it over by hand, it "hissed" at me with the plugs in and when I filled it with new oil and primed the pump, the pump fought back against me pretty good.
Under the valve covers was a different story......all sludged up as you would expect, but no broken rocker arms, springs, or bent pushrods.