I've got a couple of them and since I'm in the middle of a rebuild am planning on converting to the PCV set up. I've read that in addition to not polluting, or smoking as your are driving when the oil sucked out of the road draft tube burns on your exhaust, or dripping in your driveway, doing the conversion gets you a slight improvement in gas mileage.

'51 Chevy 1/2 ton w/'62 261, HEI, offy, fentons, dual carter/webbers, t-5 & 12 bolt posi