Off the top of my head? Clean it meticulously and maybe a little JB Weld, then sand it smooth?

 

Here's the scratch. What do you guys think?

 

Is the scratch the curved one in the dark part of the picture at the top, or the little shiny dings on the lower part of the picture?

If it's the lower dings, I would take a flat file and gently smooth them a little and put some Copper gasket sealer on the head and driver on!

 

The shiny dings at the middle and bottom. The valves are up top.