First of all, make SURE that the machine shop PRESSURE TESTS the head to ensure that there is no corrosion damage. Frankly I am worried about your $180 valve job. This probably does not include enough money to replace the valve guides and I would not even DREAM of going to all this work on a 103 engine without replacing the valve guides.

As far as the timing chain guide goes, I have not replaced it. You must have tried to leave the top timing gear on the chain. That's the only way I can think of that would have broken it. Anyway, I would think that if you pulled the pin while somehow holding onto what's left of the guide, you could get it out, then lower the new guide in place and push the pin back in. Do you know how to pull a chain guide pin?

Congrats on your work so far.

Good luck,