The biggest difference I noticed on the heads was the spark plug location. I was trying to get the whole head in the picture; a close up may be better.
There are a couple of deep vertical scores near the top of the bore; maybe 1/2" long. If you look close at the pictures of the pistons, there are deep nicks in the edge of the pistons. I am thinking I have to replace pistons for sure. Perhaps pulling and doing a complete rebuild would be better??? Compression in order 1-8 was 40, 53, 70, 30, 60, 40, 70,70