Not much of a choice with the pre-'99 4 valves. Find a shop that will powdercoat them chrome. A friend of mine that has a Mach got his from Holcomb Motorsport for $500 a couple years ago. They still look like brand new even now. If you get them in the old fashioned way of chroming they will probably peel.
My bad man, I haven't looked into it that much. I left that type of stuff stock on my car. I just went with the blower. I haven't modded my car in 4 years.