I would probably put at least single platinum plugs in it as well. I had Autolite copper plugs in my 2.3 for about 10k miles after I had it rebuilt, pulled them to inspect at that point and the center electrodes were already halfway burnt off. I replaced them with single platinums. I don't see any reason to ever use copper plugs in a modern vehicle, they just don't last long enough to justify the time spent installing them.