The original 272 had the vent with the filter but I have seen later Y blocks that do not have that so how does the ventalation systems work on the later motors and what different parts do they have compared to the earlier motors,I will most likely adapt a PCV system when I put a 292 back in.  Now can I still put on the earlier vent on a later motor for the look of originality only.

Butchering up everything I can get my hands on in Dayton Ohio