The bikes you are showing are a higher model than a PH8 (ie xx-10); if yours bike is a PH8 with a similar paint scheme than it is probably a 1981.
Site Builder One of the questionable points are the downtube shifters on the two bikes you posted; the PH8 came with stem shifters.
Is there something wrong with the current BB? Unless it has been run dry and dirty for a time, it should be good after a rebuild..If it's loose, it may just need to be tightened up..