Trying to change front main seal on from what I think is very early 60;s 283 chevy . The bottom pullys were bolted to keywaed crank pully witch took a harmonic balancer puller to get off { mind you no bolt to draw it back on} So how is it reinstalled and if pressed on ? If pressed to far in is it no good.Not sure if i should pull back out a few 1000s Any help would help.I wish i could work on newer iron but . Thanks Marco