Well I am actually swapping the engine block for one with 77000 miles. My stock block (79000 miles, coincidentially enough) spun a rod bearing. The engine I am replacing it with has a new timing belt and I will be doing cams and cometic head gaskets. What else should I do while the engine is out? Water pump? Anything else?

Water pump, t-belt tensioner

Say, would you happen to have part numbers for those two?

....STi shortblock :D

also do oil pump, and check valve clearances.

oil pump, first thing

New header studs,nuts and header gaskets.
Good time for group n engine/tranny mount
new oil & filter
new coolant
t-stat
Rear/front main seals
oil pump seal if you're going to do a new oil pump
t-belt if your doing a water pump