I would suggest you try the MP part first.. a lot cheaper for something to just try! Sorry I don't have the PN handy... but it has been given in threads about PCV valves here in the last 1-2 years. It goes from low to high flow state at something like 9-11 in of manifold vacuum rather than the 14-15 in of the stock one. Looks and fits like the stock one.
And if you want to try a different one that I know works OK, then you could temporaily adpat in a Fram FV191. The model change state at around 10-11 in vacuum. But it is made with a larger base so you either have to kluge it in, or change the valve cover grommet to one with a larger hole.
