I cleaned up all the oil mess, and then took the car for a short drive.
Fortunately for me, when I had everything apart to swap the cams, I removed the plastic plug wire spider and also didn't reinstall any of the plastic parts around the distributor caps, so I have easy access to see and clean everything. I didn't see any reason to reinstall those, and they were actually in good shape so I thought it wise to save them now before I go bounce this car around offroad.
When I returned from the test drive there was oil that appeared to be dribbling down from the cam sensor. I yanked the sensor out, cleaned everything up and reassembled with a new o ring. Took it back out for another drive and it was still leaking, but this time the source was clear.

The oil is leaking from the timing chain guide pin.
So I guess I just need to figure out the best way to reseal that. I'd prefer not to have to disassemble a bunch of stuff to deal with it. Because I know that guide is broken, I also know that if I fully extract that pin the remaining half of the guide would drop down inside the motor, so I want to avoid that. I'm thinking maybe I could extract it halfway, goop it up with... something, and shove it back in. I'm hoping the pin itself isn't cracked and allowing oil through the inside.
Has anyone seen this kind of a leak before? I'll do some research and see what I can find, but if anyone has any experience with this I'd love to hear your thoughts.