is the rubber on the dampner pukeing out if so it has rotated.

if you have the timing cover off line up the dots this will set you up to fire on number 6 first but is easer to make sureyou have valve timing correct. now if you rotate crank 1 turn this will put both dots up engine readdy to fire on #1. now slide your dampner on until you know the keyway is lined up compare the timming mark to your timming cover and the mark should be in the range of the timming tab if not the dampner is bad.