School me on Stock Eliminator?

I debated back-n-forth over the new Chally Pkg car & finally decided to try to get one. With 9 possible combos to say nothing of using a 2nd Gen Hemi, for SM or GT racing the package offers newer technology for racers, possibly some factory help along with a packqge that already deletes some items, making it technically a stocker. Yes it's expensive, & still doesn't have quite the appeal of an old Challenger but depending on factoring, etc. you still ahve the benefit (?) of a facory built (?) racecar. The '68 cars & SS/AH is beyond most enthusuiasts wallets & those cars won't be around forever. This offers racers a package to run for the next 10-20+ years with the potential of going just as fast eventually as the '68 cars.