I have to disagree, the piston tops look fine. I'd take the head to a machine shop, have them pressure test the head for cracks, check the surface for warp, have the valves ground or replaced, check the valve guides for wear and replace if necessary, install new valve seals, and put it back together.
Bring each piston to the top of its stroke and use a scraper or razor blade to get the carbon off the piston top. You can use mineral spirits or brake cleaner to clean it up.
Use the scraper or blade to clean the head mating surface on the top of the block and clean it. You want this surface to be as clean as you can get it so the head gasket get a good seal. I'd also remove the rocker arm assembly before setting the head back on the block. Install the assembly back on after you torque the head to specs.
I've been a professional automobile technician for over 30 years, and I'm advising you of the way I would repair the motor as if it was mine. I believe my email is open if you have any other questions or concerns.
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