Dealing with this guy seems like asking for trouble. As everyone has pointed out, the car is not worth much yet the seller throws out numbers like online value of $120K and supposedly turns down offer of $45K. One of the seller's comments from your original thread jumped out at me: "Have you ever been sued?"
My initial reaction is to walk away completely. Alternatively, make a reasonable (i.e., low) offer and take-it-or-leave-it. When the seller wants to negotiate for more, then walk. There are plenty of non-R/T Gen II Chargers out there in much better shape that you would be money ahead unless you get this for minimal $. If the seller wants to jerk you around, let him find another buyer.