According to the website flyer.... "hundreds of Cobra Jets, including Mustangs, Shelbys, Fairlanes, Cougars, Torinos, Cyclones/Montegos, and Rancheros (all tributes/clones permitted)", so I'm not sure if it would include cars that never originally came with a CJ engine, but any car that COULD have came with a CJ engine would be permitted.
My car is an original CJ car, so even though it's got a 427 in it, nobody would know the difference unless they spotted the sideoiler galley on the block...or the 427 badges on the scoop might give it away

Either way, I'm not to interested in going with the $200 price tag. Pretty disappointed though because I think it could have been a pretty neat event.