[blucar]

I have been a firm believer of PCV's on older vehicle for over thirty years, I have had a lot of experience with the Ford 292/312 Y blocks in "56-57 T-Birds and '59-64 F series trucks. I used a PCV system from a '63 292 F100 on my '57 Bird in 1971, the PCV stopped blow-bye/oil leakage from the filler neck, and crankcase vent on the side of the block.
A side effect of the addition of a PCV to my '57 Bird was it made the car California emissions compliant without having to add a bunch of ill conceived emission equipment that California was requiring in the early '70's on pre-smog equipped vehicles.