I think most machine shops would recommend a line bore whenever a new crankshaft is installed, just so they cover their asses. Whether u actually need it, is another matter, as you have no way of checking that. Also if the crank is remanufactured, that might mean they ground the bearing surfaces down, and if so, you will need new oversized bearings. Can't say what the average price is, as i live in AK and everything costs more up here.