You need to mic cylinders to measure out of round and taper. Skirt probably broke from piston slap . IMO, tolerances would have to be less than half before I'd just put new slugs in. The biggest cost will be pistons, gaskets , bout 3-350. Cyl bore maybe 100. You might also have to split cases to remove all debrei , if you do use new crank seals, 20. JMHO, your results may vary. Btw, piston oversizes are in .010 increments, unless you have bad gouges, you should be able to go .030 oversize, still leaves you five more overbore sizes to go.