Barely broken in... Famous last words when you are buying a wore out POS. It can go a million miles, but, this one didn't...Yup!
And so much more.
I can't believe someone would use a crank that was so damaged. But, I guess if you could get it balanced, it would work just fine.
At least as good as the original was "balanced" *cough*
154k is barely broken in on a diesel.
Rodd, you're pretty deep into this motor, I would suggest doing a LOT of reading on this and other forums first and also getting a factory repair manual. Most of all the information you may need will be there at your fingertips!
And then the considerable brains here can help you fill in the blanks. : )>