Have you physically miced the journal to see that the size has changed? Because even with that crack, it shows no sign of the bearing grabbing the crank, which would be associated with a knock in that quick of a trip. Sounds like there where other clearance problems , and you just happened to notice the crack. Post a picture of the bearing that was on that journal. What was the oil pressure?
I am not trying to argue with you, it just seems like you have more wrong than you are blaming eagle for. I have several cracked crankshafts in blown engines under moderate power. Stuff happens, repair it or replace it. I hear several people bad mouthing eagle, i disagree. You get what you pay for. They make good entry level performance parts that are afordable for budget racers.
http://www.winbergcrankshafts.com/cranks/mopar.shtml
Each crankshaft starts as a non-twist, progressive die, 4340 steel forging. All processes are done in-house at our manufacturing facility, including numerous quality checks. The result is a top of the line, 100% American made Forged crankshaft.