I am not sure what they called the 68 440 Darts......M code or what? They were made specifically for Landy and a couple of other teams and that was it. They would be worth a mint I am sure.
Quote from the gtsregistry.com website:
"Dodge ordered up 48 383 GTSs that were to be converted to 440 GSS cars for Grand Spaulding Dodge. The 1968 440 GTS/GSS cars were all true "M" codes too! They were shipped to Hurst without engine. At Hurst, the 440 was dropped in, the battery was located in the trunk, and the car "finished" before being shipped to the corner of Grand and Spaulding in Chicago".
There are only three GSS' known to exist listed in the registry right now!
Jim your M 'Cuda is coming along very nicely!!