The first thing is to clean and remove the valve cover (carefully keeping track of the bolts and special spacers) I then measured the location for the breather assembly, between rocker arms and #2 injector. The cover is quite thin and requires reinforcing. On the inside of the cover I drilled the center location of the breather. Next I cut a 4 1/4 diameter piece of .058 Stainless steel and drilled a 1/4 inch hole in the center. Using a 1/4 -20 bolt I bolted the stainless temporarly on the inside and penciled a line around it.
I removes the stainless and made a rope-caulk dam on the pencil line to keep the epoxy in place. I applied enough JB weld to fill the area and bolted in the stainless in place and waited for it to cure.
On the top side, use the breather to draw your circle, Make similar rope-caulk dam. Carefully fill the area with JB Weld and allow to flow out and level fill the area. Allow to cure overnight. Remove your 1/4-20 bolt and re-drill the hole for a 5/16"-18 bolt. The bolt will need to be aprox 5 and 5/16" long. Fasten bolt to valve cover with a washer and nut. You will need a lock washer to hold breather on. You will need to drill 9 or 10 3/8" holes in the cover. (In a circle just inside the area of the breather) Attach the breather, "O" ring and lock nut. You can now attach the breather hose. (Somewhat modified with 1" oil proof hose and 1" copper fittings)