Yep ... what dkveuro said .... if the crankshaft snout is torn up, forensically speaking, it is likely that someone forced the balancer on wrong once upon a time and destroyed the dowel pin reliefs ... a shame I have a 617 952 layin' here in my yard that I r & r'd for a friend with the same issues ... stay positive pull the balancer off, inspect the crank snout and hope for the best.

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78 300d 158k driver
80 300d 200k fixer
80 300d parts car
98 Cherokee 240k

" I know for certain that someday while parking or un-parking my Jeep Cherokee, I'm gonna' either pull the headlight switch right outa' its dashboard OR stomp its hood release lever clean offa' the kick panel. It's just a matter of which will happen first."