<VV> Advise on PCV needed

[Grant Young]

I am working on a 1965 Corsa with a 140HP, 4-speed engine and discovered that a PO has removed the stock vent pipe from the top cover to the shroud and replaced it with a early "road tube". I am wondering if there is any mechanical disadvantage to this. I have the parts to put it back to stock to feed to the air cleaner and balance tube (with PCV orifice). I don't see how it might affect engine performance, but would like some advice, to be sure.
Thanks,
Grant