Engine color depends on what look you're going for. Personaly I like the Chevy Ornage, with the alloy heads and timeing and such. Lots of shadeing could be done. If your going for a stock car you almost have to show it as is. Might take a look at a local Chevrolet dealer to see how Chevrolet built it. It's upto you. Like Burger King, you get it your way. Keep use posted.