G'day Dave - re the breather.
When I first got her on the road, I didn't have anything connected to the breather tube on the plate and the oil from it just ran down onto the diff and made a mess. So I made up a sort of catch can by running some heater hose from the breather tube up to the air cleaner and put a tap and drain pipe in the U part of that hose so I could drain the oil every so often. However, I think I may have restricted the breather a bit as I started to notice a slight oil weep from the clutch casing.
So I took the homemade catch can off and just put a length of hose onto the breather tube and ran that down towards the ground so the oil doesn't make a mess on the diff but it does get blown under the car a bit on the passenger side. Inbuilt rust proofing.
I have got a S side plate that has a larger opening plus a canister on it. I was going to fit it but access is a bit tight with the manifolds on and I'm a bit reluctant to pull it all apart again in case I make matters worse and end up with more leaks - either manifolds or side plates. I assembled everything on the engine before I put it in the car.
The tappet cover vent is plumbed into the air cleaner.
Cheers Rocky