As you have a good crack free set of heads and valves I would use them. If you didn't have the parts I would just start with a set of aluminum heads.
I did a set two years ago, putting in oversize valves allows you to cut new seats and set the heights where they should be. I had mine plunge cut first and then hand blended them. I was really happy with the way they worked with a .528 mechanical cam.

Sheldon