Beechtech is right on Wayne, the nipple is a crankcase breather, it allows the oil to "flow" through the crankcase , if it were to get pluged up you would not get any oil flow through the case and your bearings, cam and connecting rod would fry so just put a line at least 4in long, that is the volume of the stroke of the piston and any shorter it will suck in outside air and you dont want that

you are in the same position i was 2 years ago, i had a evo 46 in my alpha and i bought a saito 100 for my 60 size ucd and im on my 7th plane now.

if you like reading you can go to the saito thread "club saito" here on rcu and learn and ask all the questions there you want and not stump those guys