i will assume your putting in a new crank and everything...
you can get a seal kit for all the seals for the crank, tranny, impeller, kicker ,shift shaft,
youll need new clutch cover seal base gasket and gead gaskets,
youll need some yamabond for the case halfs.
a torque wrench
clutch holding tool and flywheel holding tool.
there might be more but thats what i remember off the top of my head...