I've got the engine ready to paint now. I forgot about a broken bolt in the cylinder head, so I fixed that and then ran out of time...
For those interested, I'll share some details on what I did. I was a little nervous about the method for this 'repair', but it worked great. The bolt was broken off about 1/2" down into the cylinder head. I've had horrendous luck with drilling, easy-outs, etc. in the past, so I wanted to try the 'welding' method. I saw this explained on Youtube - I think from Sloppy Mechanics channel. Basically you build up a bead on the broken off bolt until it sticks out of the head, then weld a nut on the end of it and turn it out. It took three different attempts, I'm not the world's best welder, but once I got a good weld to the bolt and the nut, it worked like a charm.
Pictures -
Location of broken bolt:
First attempt didn't bond to existing bolt and quickly snapped off, second attempt got the bolt about 1/4" out of the head, and the final weld held.
Final welded on nut after bolt was out of the head a bit:
Bolt out!