some people choose to advance or retard the crank sprocket 4*. i didn't feel like i understood that, and i knew i didn't want to tear it back down if it didn't work out right.
you'll want to replace front seal and water pump and water pump bypass hose. check for leaks on rear seal, if its leaking you might want to do it and oil pan gasket.
you sig says you've already fixed the plenum, so no need to tear into the top.