Yeah, if it was timed at sea level and ran well down there, it probably would benefit from checking and resetting timing for higher altitude.
Agree that it's best to not just start moving the pump, it will help to check where it is set now beforehand to give yourself a baseline to start from, and you don't want to end up with it too far advanced either. There is timing info somewhere on here, and it should be made a sticky anyway -- you should be able to find several tutorials by searching, and if you see one you like you could post a link to it and we'll stick it to the top to make it easier for others to find next time.
Several people have put EGT probes in the exhaust manifold where all the runners come together just before the turbo -- maybe someone who has direct experience will speak up here.