They are rare because most larger trucks were run into they ground and then scrapped. I collect larger trucks because I have owned semis for almost 50 years. I personally would have no interest in anything with a 471 and a sleeper. They were way underpowered for their day, but some collectors like them just for the noise. I see lots of stuff missing. The rear could be replaced with just about any rear with 4.11 or 4.33 gears. The sheet metal and other parts would be a problem. I see a huge money pit and if you ever finished it, it would be very difficult to sell because the demand is such a small nitch of buyers for something like this. If I wanted a cannonball, I would look for one that is much more complete and use this one for parts.