Misfiring all of a Sudden

To close this thread, several things I think led to my misfire.

1. I had recently disconnected the OSAC valve. I completely forgot to cap the carburetor line, so I had a small vacuum leak there for the past month or so, which may have contributed to the problem.

2. I went ahead and installed a new Echlin Napa brand PCV. Kept the old (original Chrysler stamped) one as a spare in the trunk.

3. New spark plug wire.

so far so good, thanks for the help guys.