Hi NG,
Yeah I see where matt's going there, not a bad idea

send one breather to each carbie... pretty simple,,
Here's how I do it having a quick looky at your picture,,,,
It looks like you will need a breather cap. Reason being that air needs to be drawn down through your rocker cover. On older style set ups they had a separate take off on the rocker cover that had a valve on it which was linked to the manifold,,, but yours being an alloy cover probably won’t have that,, so you will need a breath cap to let the air in. You can pick them as they stand taller than a standard cap by about half an inch. The part number for the genuine breather cap is 13H2296EVA and should cost you about $15 -20.00.
Now I can’t see your whole engine bay very well, but it looks like you have 1 large hose which is at least headed in the direction of your crank case breather.. It looks like that one is for your brake booster if you have one,, if you do not have a brake booster plug it.
Now, if you look at the two carbies there is a brass pipe comining off each of them 5/16” in diameter, about 1” long and pointing up at an angle of 45 degrees, from each of these attach a section of hose about 3” long. Now place one branch of the Y piece in one hose and the other branch in the other hose. What you will have now is both carbies connected together at this Y piece in a triangle with one remaining branch pointing straight up in the air.
From that remaining branch attach a length of hose directly to your crank case breather, the one on either your timing cover or above your clutch housing.
Now, on your left hand carbie, on the side, there is another brass pipe about 1/8 “ in diameter. If you are not running a vac advance on you dizzy, block off this pipe.
Does this answer your question or help?