It always does here that's why I try and define overhaul. rebuild. balance and blueprint.
Most here do any combination of the second and last one and it always $kyrockets the bill because its not their money .
i still say clean and check stuff then decide what will work and machine what you have to for an overhaul / rebuild. Ideally an overhaul would be all done at home with little to no
machine shop work and home honing etc. hand lapping valves. basically if it doesn't need it don't buy it .
Another thing on here when troubleshooting its allways the worst thing it could possibly be noone ever says "did ya check for spark/fuel/ timing/major engine damage?