Wilsons Sandbox

I was just looking over the July 2004 issue of the Totally T-Type which I had downloaded off the web and came across an article by Tony (sorry, no last name listed) on installing a crankcase breather on his XPAG. http://www.tregister.org/ttt.aspx From the side plate breather he ran what looks like 5/8" hose to a flame trap and then onto a 'B' series breather valve screwed into the intake manifold balance tube. This creates a positive crankcase vent, with lower atmospheric pressure in the crankcase thereby keeping in the oil better. My questions are: 1) Has anyone else done this and solved oil leaks? 2) Can I just use a generic PVC valve and smaller tubing? Seems to me American cars ran 1/4" or 3/8" tubing. 3) Is the flame trap necessary? I don't recall American cars having those in the PVC system or maybe it was built into the PVC valve. 4) Would I have to enrich my carb mixture (turn adjustment down a couple flats) change needles or anything else. Thought I would give this a try but though I could learn from others before starting. And the large tubing kind of junked things up so thought smaller tubing would be less unsightly. David Edgar, TC 5108 El Cajon, California