I discovered that the pin in one of the roller lifters had worked it's way loose and the wheel is chewed up. The corresponding lobe on the cam has a pretty good ridge in it. One of the burned pushrods corresponds to that lifter, not sure if they're related.
I'm not used to looking at cylinder heads. They're C8-AEH castings. They were advertised as being worked over and have hardened seats, bowl work, with matched cc chambers. I can see that they have double springs (or helper springs?), one piece retainers, viton valve seals. The bowls appear to have work done, there's casting flash in the intake runners. The valves are ~2.058" intake and 1.056"ex., 0.368" diameter.
Is there a good resource for FE heads with pictures and so forth to review in order to better evaluate what I'm looking at?