There a more than a few documented cars in outstanding condition, and a few dozen belong to this site's members. Personally, I think a serious contender for "nicest" (condition, history, paperwork) of them all is Brian's Daytona Yellow car, or perhaps his "ex car" as it was advertised for sale some time ago (see
https://www.yenko.net/ubb/Forum3/HTML/000096.html ).
Described by Brian as:
7200 original miles. Original Daytona Yellow paint with black vinyl top and stripes. Rare X66 trim level Yenko. O1B build date, one of the first Yenko's ever sold at Canonsburg. All original glass, interior, chrome, etc in mint condition. Original numbers matching 427 L/72 and BE rear. Rare power steering car. Mag wheels with Goodyear WTGT's. This car is equipped with a Yenko built and installed competition 427 with a host of extras including special race transmission, Hurst shifter, etc. To many special Yenko items to list. This car is the only one in the world with these options. Fully documented with inventory sheet and all Yenko receipts for all special work done for the competition driveline.