Well, first of all, there has to be an inspection upon disassembly, what the bore sizes are to either find matching cylinders to replace mis matched jugs, what the crankshaft specs are to order bearings, what camshaft is in it,,, if part number ends in 877, you need an 878,,, a proper valve job,,, guides if needed,,, seats replaced if exhaust flanges have been welded and resurfaced,,,,,, there are many variables to quote an overhaul price on a 220.