I'll add a few things to Don's list:

Plasticguage (I ALWAYS check the rod and main clearance, even a machinest has bad days and parts do get mispackaged)

Feeler guage to check ring end gap

Ring compressor

thread sealer (if the engine has headbolts that go into the water jacket)

harmonic balancer installer

good torque wrench

manual of your choice showing bearing clearances, ring gap, torque specs and firing order.

Paint of your choice

Don't forget to check and make sure the oil gally plugs and cam plug have been installed.