A friend of mine has a 73 convertible that he is taking to get appraised tonight. It is a nice car with fresh paint, 429cj(1971)with ram air, c6 auto. It was originally a 351c car.Kelly blue book says the value on this car with the 429 and ram air is 19-32k. This doesn't make sense to me, the 429 wasn't offered in 73, so why does Kelly say to add 35%?? Does the fact that this car has the 429 really add to the value being that it is not original? He feels the appraiser is going to come in at least at 19k. Is he setting himself up to be disappointed? TFOB-if you read this, this is the green convertible that was at the Grand Rapids show.