Someone has made a switch somewhere along the line. They would both have to match and be one or the other. Post some pics and maybe it will be obvious as to which is not original. 138 is SS and 136 is malibu
A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more!