Your plugs look dreadful but the compressions dont seem too bad. Its possible the compression rings are ok but the oil rings are shot. If you are taking the head off anyway, they normally say use a new ring near the top of the bore (where all the wear is) and check the gap is within tolerance. That way you know if the bores have had it. Imagine you can rebore and fit oversize rings. New valve guides and seals would be a must but read up on how to remove the cams or you may snap them. I'd also want to make sure the oil pump is ok while its down. All depends on how much time - and money - you want to spend