I found a 1/24 scale pro-touring '69 Firebird die cast that has the exact wheels I am planning on buying. So I bought it and painted it in my paint scheme (the main color has a little more pewter look to it than my actual paint but it is close):
...It's not perfect, but it does give me an idea of what my car will look like. However, I will not be running staggered sized wheels.
I am on Mr. Hermance's schedule for a rendering which I am SURE will be a better representation!
Phil