Well I picked up another of the Revell 1979 El Camino 3n1 kits, and decided to get started on it. No idea about color yet, but I will be dechroming everything for the monochromatic look.
Drivetrain will be engine and trans out of the AMT c1500 kit, complete with high rise intake and dual quad carbs. Suspension will be out of one of the 90's NASCAR kits.
Here's how it will look with the wheels and tires I've chosen. Wheels are kit wheels for the "custom" version, and tires are from Aoshima (chosen because they look like Mickey Thompson tires).
Closeup of wheel/tire combo.