Maintenance while tranny is out?

I just picked up a B5.5 5 speed with the tranny removed due to broken clutch disk. I'm wondering if there are any parts I ought to replace while I have the extra space. I'm thinking the rear coolant neck for sure anything else? Car has 300k on it.

Tandem pump should be easy to see at this point

Check for leaks at your tandem pump while you have a good line of site to it.

Also any coolant leaks that you may see at the cooling manifold below it The seals tend to swell from oil/diesel leaks from above, this would be the perfect time to make an awkward job a heck of a lot easier.

You would be replacing the tandem pump seal and the coolant manifold. I regret having to do both shortly after I did my 5 speed swap.