One of these.... http://glennbunch.com/ inside is the 40 year history of what it takes to make one of these cars a world beater on an international racing stage. It ain't easy, nor cheap and there are lots of pitfalls along the way.
Again, not easy or cheap, and to be honest, there is not much of the original cars that remain in either case. However, with Dodge getting out of Nascar, I'm sure there are a lot of W9/P5 race engines out there that can be had cheap. Reskin an older cup chassis with an old PLymouth and boom, instant classic car with high speed capability ala Ray Evernham's recent '64 Plymouth build.
Neat thing about doing something like this with a Charger or Road Runner is that they already have coke bottle styling to contain the wide rubber. No flares required.
