The problem here is, unless you clear over all the flames, you'll be able to feel them and they'll have an edge exposed to the weather that can allow moisture under the surface. Fine you say, clear them all? YOU CAN'T have FLAT color and have clearcoat. Clear coat makes anything thats flat, shiny.
You can do either all flat, or all gloss, but not both without having a hard edge. Heck, even all flat you will have an edge because theres no way to smooth it in without clearcoat. Watch the Jessie James program on Discover. He had flames done on a tank and you can see how the process works. They painted the entire tank one color, masked off the flames, sprayed the flame color, unmasked, then cleared the whole thing and color sanded it smooth. That is the proper way to do flames.
If you decide to go with flames, make sure the shop knows what they are doing because an ugly flame pattern isn't something you want on the car, and once its done, its pretty much permanant.
BTW, Flames are played out, I put them on my Honda 3 years ago(
http://web.tampabay.rr.com/mycar/Car.htm ), then every idiot in town started to get them. I even saw some spray paint them on stock paint. Now every idiot in town has flame graphics, flame chrome grills, flames in their tint, flame seat covers, etc.
I'd suggest laying out your own flame pattern just to be sure, or ask to be present when they lay them out.
BTW, I work at a shop so repaints don't cost me anything but a bit of my time. Its fun to experiment some times but always plan ahead.