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I would hate to see you junk it, but the answer depends on what you intend to do with it. You say you like it, but it sounds like its for sale if the right money comes along. The last U crank I had ground cost around $400, but It went thru 2 other machine shops before I got it back, so each tacked on their markup. (I should have kept up with where it was-I Could have hauled it to the shop in Charlotte NC myself cheaper than that.) I see in a catalog here a crank kit is $239 bearings included. Rings, std. are $109. Head gasket set 109.99, conversion set (rest of gaskets) 94.99.
That doesn't include grinding valves, honing cylinders, crankshaft seals (NAPA), the ring gear or labor. These are last years prices so they probably rose some, too. You ask how hard it is-If you have experience with engines its no harder than an automobile engine, except the parts are larger and you have to take the sheer weight of the components ito consideration. For instance, the big end of the rod won't go through the cylinders, so you have to put the pistons and rods in before you re-install the blocks. This makes each assembly weigh 100 lb or a little more. I've found out its easier to take the engine apart in the tractor-heads, cylinder blocks & pistons, etc.- and then remove the crankcase and crank and flywheel (split the tractor) last.
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