[Brooklyn-427]

Similarly, once the FORD 427 and Hemi blocks were outlawed by NASCAR, it's use to FORD disappeared and the Cobra 427/8 cars were lost forthwith. Of course, neither did they sell; in my opinion, because they were too expensive and excessive compared to 'Vettes and Jags. Too much fender, too much fuel and too much $$. Big depreciations were killer.

To me that just comfirms that Shelby and Ford just seen this a race car project to market their new showroom products.
AC cars continued with Mk111 289 car at that time because there was no market for the FE engine variant in England. And sales were falling back due to other reasons. The cobra was part of AC`s product line that had started 10 or more years before with the ACE they had too continue until they had another car to replace it with. Unlike Shelby who just dropped it like a lead weight too move forward with other new projects. It was yesterdays race car , speed and technogoly had progressed quickly.