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@TheBrick(Tommy)
I have only bought two cranks brand new (both road) but both of them came with documentation telling me that x length b.b gave me a y chainline so I just used that as my reference point (remembering that your b.b is symmetric so double the difference is needed if you get me). So try waiting and see if the cranks come with any documentation.
Alternatively Mr Brown says that an iso crank on a jis b.b will run 4.5 mm further out (from memory google jis / iso inter-changeability to check) so wait unlit your new cranks come put your iso cranks on your jis b.b measure the chainline and use the 4.5 mm and your current crank length to work out what you want.
That my only ideas.
P.S Buy a spacehopper too.