Just to revive an old discussion...
This morning on "My Classic Car", Dennis Gage was riding in a
1956 Lincoln Mark II that was built for William Clay Ford. WCF apparently drove this car for a number of years, and in 1968 had it retrofitted by Ford engineers with the Mark III drivetrain, including a 460 engine, C6 trans, and disc brakes.
The reason I mention this is that the AACA gave this car factory original status as the changes to the car were completed "inside the walls of Ford" as Gage put it on the show. Applying this logic would make the Estes car "factory-built".
Interesting to note that the only Camaros AACA recognizes in their Factory High Performance class are COPO and "Yenko" Camaros (see
AACA judge's manual Class 36B on page 37). They recognize "all" Chevelle SS396 and SS454 cars, but no Camaro L78 or L89 cars!
-Sam