Depending on which kit you are using for the base, you may want to find a Revell '66 El Camino kit as well for some parts. That kit would provide you with a correct style grill and hood for a non-SS car. The other part you might want to find if your son's employer doesn't have bucket seats would be either a rear seat from another '66 Malibu or the Revell '66 Malibu station wagon. That seats would have the correct seat pattern for a Malibu level interior trim. The front seat back would need a little modification to replicate a folding seat back. For the small block Chevrolet engine, the 'Revell '69 Nova SS kit has a very correct looking engine and even the correct exhaust manifolds for the '66 Malibu.