On a lot of GM engines the year, engine cid, division, or any number of other reasons determined where the PCV was located. This is inconsequential the only neccessary fact is that the hose leading from the valve be connected to the proper port at the front of the carb(esp. 4 bbl, not too familiar with 2bbl, I always convert my manifolds). Anyway hope this helps. Get a vacuum diagram for your carb and it should show you.
Peace.
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