Dave, I always use Testors Clear acrylic paint to get scripts to stay on the body. Paint the Clear on the back of the script, apply it ti the body, and you're good to go! These were done back around 2004, and are still holding perfectly!
Michael, did you consider House Of Kolors Root Beer? I've used it, and it's a great color, but I'm not sure how close it is to what you're wanting, here's a couple of pics of it. This is over a Copper base, with Silver for the stripes and side coves.
Nice looking kit other than the paint issues, I built one years ago, and it is not an easy kit to get together at the end! The paint issues you have are simple, HOK paints are true Lacquers, Tamiya is a Synthetic Lacquer. The HOK ate right through the Tamiya Primer, that's all. Next time you use HOK, use a barrier to protect the underlying plastic. I use Dupli-Color Primer-Sealer myself, others use Future, Plasti-Cote, etc, just find something that will save the model from the "hot" solvents in HOK paint.
Richard, the old AMT '72 Nova kit comes with separate fenders, if you could find one (The old issue had the "Old Pro" box art, the current release is the "Beverly Hills Cop" box art), the fender could be used, or you could take the cowl area from the AMT kit and put it on the Revell kit. I don't know how hard that kit is to locate in your area though....
Chrysler did Wind Tunnel testing of a '71 Daytona and Superbird, but they never went into production due to NASCAR changing the rules to outlaw them. I built one of these a long, long time ago, but went with a single wing, I didn't know the cars existed when I built mine, so I did it how I thought it would have been made, no NASCAR stuff, just a street car.
I dug around on their Japanese website and found this, it doesn't list as an Etching Primer, but it is designed for Metal. It's listed as unavailable here in the US, but you can apparently still get it from Japan.
Ahmed, I'm not sure Tamiya makes an Etching primer myself, I don't use their paints often enough because I have Dupli-Color readily available. I'm sure someone here can say yes or no on that. Here's the link to Tamiya's site, and a link to their online catalog page. http://www.tamiya.com/ http://www.tamiya.com/english/products/archive.htm
Follow Dave's advice with the Primer, the etching Primer will work perfect for the metal body. If this were my build, especially since it's metal, I'd go with Lacquers all the way. Faster drying, better shine when polished out, and you can simply buy regular Automotive paints, you'll need the bigger cans for a 1/18th body!
The Tamiya RC paints would work fine on a metal body, they're way too "hot" for polystyrene though. I'm not sure if the dry flat, since they are sprayed on the inside of a clear body, they don't need to be glossy.
If you use .010 or .015 clear sheet, it should be fine. I know Pegasus Hobbies makes rims sets, but I don't know if they make 1/18th scale. You may be able to use a set from another Die-Cast, that's the way i would go at least.