I think if you look at some early pics of factory cars and pics in the Schield book the factory got that center section beat back too. They must have had an even bigger hammer.
Pic of original car here:
http://board.moparts.org/ubbthreads/showflat.php?Number=6410500
This is the car that barely got the valve covers to fit with almost the same panel beating as you did.
1968 Super Stock Hemi Dart from Hurst Walk Around - YouTube
Same car, this was what Troy did and it was really too close for comfort: