I run a factory style PCV valve on my 63. Been using it since this eng went in my car in 2011. Its mostly a street car as I only race once or twice a year but its never spit any oil at the track. Course the other valve cover is a brether and I even consider just using a breather in both covers at the track like in the old days but as I say its been fine with what little racing I do and on the street. Ron

Back in the mid 70s I had the poor mans vacuum pump, pvc hooked to the mechanical pump that dumped into a catch can, stopped the blow by and oil leaks. Had em all scratching their heads on that, each week they would mosey over to see what new trick I came up with (most didn’t work lol)