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 - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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