Just one other thing to have a look at before you button it up Rob.
Under the shifter cover, there's a small rubber plug that terminates the gallery.
We had a discussion here on the board awhile ago about this.
From memory, some of the early cases were left closed at the factory whereas the later ones were sealed with a rubber plug when the gallery was bored right through.
I don't think that there is a part # for it.
In the past, I've used a brake shoe rivet with some sealer and then the shifter cover and gasket sits across the top of it.
If the cases have ever been hot or cold tanked, that's generally when these plugs swell up like jelly and fall out which is a bit of a trap.