Update 5:
Finally... after disconnecting the exhaust header flanges (and cutting one of the pipes (between header and cat) I was able to lift the head enough to get at half the exhaust manifold nuts. After removing the nuts I was able to lift the head out with the other header attached.
It looks like whoever did the exhaust didn't do such a great job on the flanges and one of them fused into the pipe... in any case.
The heads were both placed on a bench and the cam sprockets were removed with the chains in place. The chain tensioners were removed and set aside. Then the cam bearings came off and finally the cams lifted and placed on the bench. The lifters were removed and stored in oil.
The heads are going to the machine shop tomorrow morning for testing/cleaning/machining. If it turns out I have a cracked head, the job is over and I'll be looking for a motor.
1994 540ia|Oxford Green Metallic|Lemforder|KYB in H&R|18" OE Staggered M-Parallel with Pirelli P-Zero