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I am in the same boat. I have the outside exhaust stud pulled on Cylinder 1. Honestly, I have little experience so take my comments lightly...
Try to gatyer data to support a decision, maybe do a leakdown and compression test. Take into account what cylinder has a broken stud.
Ask yourself if you are willing to pay the extra cash of full rebuild. I will assume you will be DIY. If you DIY to learn, why not learn it all. If you are DIY to save cash, why open it?
If you teardown the top half and see troubles, I think you need to redo it all... I hear the "experts" say teh bottom end is anintimidating thought, but isnt really hard to do...
I have done what I think is best, cry like a sissy to the wrenchs in my local PCA region, and coaxed them to my garage (with their tools) with beer, food, and motor work -- this stuff is the hunting equivilent of a salt lick... I figure pay the mechanic a ton of cash to do the rebuild, pay him to redo my rebuild, or buy lots of beer and food and look as pathetic as I can...
I hope this somehow helps you...
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