Here's a visual look back at the AMT '64 Chevelle El Camino, kit #8734, relying upon found images on eBay. if anyone has this kit and is willing to take and share images, please do.
The inline six-cylinder engine and Westcraft boat were only available in this kit, and I don't think the custom body pieces (hood, grille, roll pan, etc.) were ever used again, either.
Good look at the decal sheet below: