Here is resin Monte Carlo LS conversion clip for the revell 86/87 monte carlo kit.
this comes with the front bumper, rear bumper, bench seat and 3D Printed grille, headlights and headlight housing.
Resin 86-88 Monte Carlo LS Clip Conversion
As with many resins, you'll need to clean up any excess flash, pin holes and wash down with a good degreaser to remove any oils from the molds. Also before paint, check fitment as resin differs from plastic parts.