I agree with everything Danny says about using Total Seal piston rings !... Period ! I had an unacceptable amount of blow-by on my 2165. I pulled the engine out again, disassembled it and only put in the Total Seal oil ring. The blow-by went to nearly 0 !
I removed the that dumb looking EMPI "sluse-box" filler from the engine and replaced it with a tiny breather-filler unit. I retained the breather box you have but ran two hoses to it from the back side and thru the firewall. There, I connected hoses to the valve covers. Which, by the way, are now easier to remove because they don't need to be "fished" thru and up into the engine compartment.
Here's the only photo I have and if you can enlarge it you will see that little aluminum breather on the oil filler port. It has a little paper filter inside that's replaceable.
The breather box up on top has no hoses showing. You can see that I originally had hoses connected to the air cleaners but no more.
Many times over the years of playing with this stuff, I have bought a lot of gadgets and my evaluation has ranged from total disappointment to total satisfaction. In this case, the Total Seal rings were a real winner in controlling the oil and blow-by.
By the way, that EMPI "sluse-box" leaks. Yes, there is an "O" rings under the cover but not on the machine screws that hold on the cover. The bottom of the box retains a small amount of oil that doesn't drain back into its engine. It leaks around the threads of the screws down there. Also you get a big "bloop" of oil dropping out when you remove the cover which is never fun to wipe up. Last, myself and two others have had this box loosen up at the connection to the engine and flop over. One guy's flopped into the fan belt. Nope, I don't recommend using this box...............Bruce