If the PCV valve isn't installed a few inches above the hole in the crankcase, it will draw splashed oil instead of just crankcase vapors into the valve. The engine will consume lots of oil and possibly oil-foul spark plugs. Simply adapting the valve to the draft tube hole without raising it well above the splash zone will almost guarantee that problems will develop. The vacuum lines need to be 3/8" OD tubing like later model systems use.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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