It totally depends on the parts used, and the person doing the work.
Myself, I think any engine I rebuild is better than it was new.
I have rebuilt many, many engines, and take care to do it right, using high quality parts though.
Some just do not care, and/or use junk parts.
As for mileage, if it was not ridden like an idiot, as in say WOT while cold etc.
And had regualr maintenance, do not worry about the mileage too much.
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