It would be good to have the head surface to true it up, but you want to remove the minimum amount of material. The amount will be determined by how warped or not the head is.
DO replace those tired old valve springs!
If the block is surfaced, the counterbore for the sleeve flange will need to be lowered a bit as well. So the answer is only if it needs it. The machine shop should be able to check this out.
The crank will need to have journals measured for out of round and taper. If they are in limits then grinding is not necessary. They can polish out light scratches w/o doing a full grind. If they are out of tolerance then the shop will see what bearings are available that require the minimum amount of grinding. The size to shoot for is whatever requires the least material removal.
Whether you or the shop supply various parts you will have to work out with them. In this area we have performance automotive types that don't have good resources to find tractor parts but could do the machining. We also have one good shop that avoids automotive and specializes in heavy diesel and industrial work. They can find any odd sleeve, bearing or whatever. A shop like that can supply all parts if necessary and sometimes get them cheaper even with their cut.
Talk to several shops if you have the option. You want a shop that cares. Ask around and see who does good work. Talk to farmers, independent truck owners, anyone who owns equipment that they might have rebuilt rather than replaced.
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