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The hose from the crankcase vent to the carb intake was started in '67 here in the states for emission purposes. Before that engines just had a breather to the atmosphere. The hose to the air cleaner does not have enough vacume to evacuate the pan. Racers use a venturi tube in the exhaust or a belt driven vacume pump to put the case/sump under a negative pressure.
The pushrod tubes are the only means of returning oil to the sump from the heads. At sustained high rpm they may not keep up or the centrifugal (sp) forces during a long sweeping corner prevent the correct drainage.
I agree that a hose is a bad idea but a -10 hard pipe, formed to the contour of the case, from the bottom of the rocker box to the sump above the oil level would help the high rpm issues but could possibly make the sweeping corner problem worse by giving the oil another way to get to the head. No way to be sure without tesing it.
The best solution is a multi-stage dry sump oil system with stages sucking oil from the rocker boxes.
ken
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