if not you could run a vacume canister. my early 235 ( babbit bearings and all, just a large bore 216 really ) makes 16 HG of manifold vac at idle and I have yet to time it. I don't know if you can bypass the road draft tube and replace with a PCV, never seen that done. I'd suggest switching to a '53-'54 235, they look just like the 216's but have a full preassure oiling system and regular bearings, not poured babbit bearings, not to mention www.speedwaymotors.com sells a electronic distributor to fit them.