First off do some research on wreckless Randy before you take any advice about your truck from him he a known con man and hack. You have a gen 3 engine and you say your front crank seal is leaking? That doesn't sound like a work crankshaft.
Call them again tomorrow and check i can help you with part # if you need some dealers where telling people bad information because they where looking up the wrong number
Wreckless Randy the guy in that video is in Michigan I believe, steel clear of him lots of horror stories. The factory service manual has all the specifications needed to rebuild. All of the engines I've looked at there is no evidence that improper lien bore is the cause of failure. Bearing...
I doubt it's the block that's doing the moving it seems mostly to be crank deflection or possibly harmonic issues, Ive noticed damage on harmonic balencer keyways on engines that have failed. Aftermarket bearings only come in 1 size and due the the bed plate design it's difficult to adjust...
Sometimes if there is another issue or the wrong oil is used the pickup can be blocked but that's not the normal cause of failure and shouldn't be a concern in a properly maintained 3.0.
There is a German company M&K that makes bearings with different geometry. I. Currently running a set on my person truck so far 10 k on it after rebuilding it from a catastrophic failure resulting in a damaged block that was re line bored for oversized main bearings.
I've rebuilt a few and while I can't give you a definite answer I can provide some insight. The vast majority of failures are main bearing failures which then cause low oil pressure to rods resulting in a spun rod bearing and if continued to drive a broken crankshaft. The bearing clearances from...