OK, the slant six in mine had 70K oldllady miles on it. Still diddnt want to play. Got Bosh plugs, new coil, rebuilt the carb, Compression testing, various timing combos, still wouldnt play. Got rid of it, and the guy who bought it had it stolen! So, maybe it was a fluke, but I havent met a good S6 yet. However, the HEI idea on the 4.2? Hmmm, potential. Also, another good idea for those in the AMC division. Take that POS electric carburetor and throw it, get a manual off an older AMC with an I6, Drive it about 200 miles, then set it all up. In my experiance, its worth about a 15% gain!