you also need to make sure you get the correct gaskets for the engine, there are 2 versions for the sump and then you have the drive side to deal with
remember to change the rear main seal behind the flywheel too while it's apart
there are so many other things to look at that you may have overlooked it's worth making a full list of everything you can do while the engine and gearbox is out, the exhaust might be an issue too as the flexies can be difficult to split apart and i don't think you can get replacements now