Healthy Head?

Take a fingernail and scrape it up the side of the cylinders all the way out the top. If you can catch your fingernail on the ridge at the top, the bore is worn enough it needs boring. If you can catch your nail on the ridge really BAD, it's wore slam out, and while rebuilding the head will help "a little" you'll basically be throwing money in the fire without seeing to the short block.