Kevin,

Getting better gas flow out of the filler neck is quite an issue- with my setup I have to use a rubber bung to stop oil egress during oil changes or top ups [rare these days!]. In dare say a fair amount of oil gets back into the inlet tract just from oil changes!

As with anything Greg comes up with, those breather connections are an interesting addition specifically designed to enhance his proprietary breather package design. Whether they would enhance my home brew cobbled together system I have no idea.

I am going to modify my S3 metal oil filler as follows. Remove the two orifices and block them off. Drill a hole where the GTS version is now and press in one of the pipes I cut off. I have a one way PVC valve used in the S3 oil fillers and plan to use it like it was in the S3 set up.

Does that make sense?

I did similar to Fred but different!
I used all 4 cam cover ports and have 1 balance pipe. My 86 oil filler has the small drilling so i left it as is.
My AOS is at the rear of the engine, as high as I could get it to make the oil in air work as hard as it can to get up there and to gravity feed back when the engine is stopped.
The AOS could have gone at the front but the electric water pump is taking up space there.