1964 292 Y block in my F-100 I am at my wits end, I rebuilt the carb, installed new intake gaskets, and this thing still idles crazy, up, down, stalls when I come to a stop, it is acting like it has a big vacume leak. Or am I missing something,. I also am curious if these came with a factory PCV valve, for some reason this one has one screwed in to the manifold just under the front of the carb with a big rubber line going to a small canister on the back of the engine just behind the lifter valley pan. I'm not sure that these even had a PCV it seems to me that this is to early for one, and that it vents thru the oil breather. I know that early SBC had a draft tube (not comparing this to a SBC ) and thats why I am thinking that this PCV screwed into the manifold is cause vacume leak symptoms, Or am I way over thinking thing All PCV i have ever seen are pushed into the Valve cover and then routed to the aircleaner plus the earliest car I have had that had one was an early 70's Impala..I am all ears and would buy you a beer or 24 if your ever in the area of Cincinnati..