The seal surface is not ground under, typically it is just polished.
Have you measured the crank journals?
You say it is scored badly, as in a failed bearing hammered away at the surface?
If so, it may not be feasible to repair. If it is a common and available crank, might be more cost effective to find a good used one. A damaged crank can be welded up, but they are never the same, and it gets expensive.
There may also be other damage. If a rod or main bearing spun, that will need to be repaired also. Again, may want to find a more rebuildable engine if this one is in need of extensive machine work.
If this is a working tractor or a diesel, take no short cuts!
If it's a gas parade/show/trailer queen, you can get by with "some" questionable repairs, but be careful.
As for finding a reputable crank grinder, ask around some of the repair shops. They know who is good and who isn't. Trust me, there are some real butchers out there!
If you don't already have a shop manual, it will be a very valuable investment. It will walk you through all your questions for the particular model you have.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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