Loosen water pump pulley bolts before you remove the belt, easier.
Don't overtighten the new housing, only run bolts down until they hit solid and no more. Any more and all you do is preload the housing so it cracks early. If leaking between front stat cover and housing itself, the crush on the stat gasket is not very much, I've added a .040" thick washer suitably ground to fit same OD as stat and glued it on top of stat to add more crush without buying new cover. Still working now years later. Of course you can have no crack in cover.