The drive shafts are always white. It's a NASCAR rule so they can be seen if they come off during a crash.
Let's see what I can recall.....
Alternators are dull aluminum, starters are black, radiators, oil coolers are aluminum. Air cleaners vary between teams sometimes.
Steel blocks, aluminum heads. These have been mentioned before.
Earnhardt painted the inside of his cars red. Most have a gull gray colour. On a car this size, a semi gloss red would be best. Gloss red is too shiny and flat red is not shiny enough.
The markings outside the car are stick on decals on the 1:1 car. 2 schools of thought on finishing the car. Some apply the decals and that's that except for a model wax application. This allows a slight reflecatnce difference between the numbers etc and the car body. Others apply the decals and then clear coat the entire car. The choice is up to you.
Been a while since I built a stock car but they are great because they make for a very colourful collection of models!