That would depend. Do you plan on rebuilding it? How bad of a ridge is there at the top of the cylinder? Can you catch the ridge with a finger nail? The amount of ridge can give you a general idea of how many miles there are on the engine. If you can feel a definite ridge, it will probably make it easier to tear down, if you choose, to use a ridge reemer to cut the ridge down so the piston rings don't catch on it. You can also measure the cylinder at the top, middle and bottom of the stroke to see if they are tapered. Measure one direction and then at a 90 degree angle to your previous measurement. If they are tapered badly, it would need to be bored out to straighten the cylinders.
For example, my 396 was 40 years old when I tore it down and had never been rebuilt. When I measured the cylinders, they were ranging from .012 - .018" oversize under the ridge from wear and were starting to taper very badly. This is just an example, but mine will need to be bored out at least .040 oversize to straighten the cylinders.
