If memory serves, the body-code information on the trucks was on a sticker under the hood. If the hood's been changed, you'll never know. Actually, most of the ones at which I've looked that did have the original sticker, the decal was seriously degraded or completely lost due to engine heat. This was the case with the Wiener Dodge, as well as a factory-bucket no-back-seat '78 4WD Ramcharger 440/auto I considered purchasing back when I was married. Had the Ramcharger not been so rusted, I'd have bought it due to its rarity and the fact that there was a ton of documentation, including paperwork verifying its use as a Chelsea Proving Grounds "chase vehicle" for the first year or so of its life.