Are you sure it is not repairableIJIJ It gonna be hard to find a crank, we are building a short block for an n7, if he is interested in exchangingIJ Drop me an e-mail if this will work.
There's shop I think in Iowa that does a lot of repowering Allis tractors and combines with Cummins engines. I can't remember their name right now but I will see if I can find it for you. Someone on here probably knows who I am talking about. I got a used '426' crankshaft and block from them a couple of years ago.
I took a crankshaft out of an 8050 Allis last year at work. I had it ground to .010 undersize. I,m not sure if its the same engine as an N7, but someone on here may know that. I work at a Case-ih dealer in MN.