If going for a bone stock car with no modifications or upgrades, and if you're trying to keep costs down I'd...
1. Replace the valves with a quality valve and give it a good 3-angle valve job. The original valves are 2-piece valves, friction welded together, and they have been known to come apart with catastrophic results!
2. Have hardened seats installed in the heads
3. Re-seal everything and enjoy!
However, if you can afford it, it would really be best to go through the whole thing while it's open; then you will know exactly what you have and what condition it's in.