oil breather

[boze]

what is the procedure to eliminate and re-plumb the breather pipe from the rear of the valley cover into the base of the carb?

[Ford Blue blood]

I'm assuming you are talking about installing "Positve Crankcase Ventalation" to replace the draft tube.  Fundamentally remove the draft tube, install a PCV valve inline to the carb base vacumn port, clean the oil fill cap or install a newer one that has a line to the air cleaner and a filter there.  You need to make sure there is a mechanism to return oil caught in the vapor to the crank case.  This can be a simple wad of course stainless steel wool under the PCV valve contained in a basket that will contain the stainless and allow the oil it captures to drain out.  Look for a PCV valve that comes from an egine of similar displacement.