This! Hey, that ZL1 is impressive, but that time slip didn't come cheap. Any car can be made to be quicker if you have a big bank account. Definitely not "minimal mods". Far from it!
I installed heads/cam/LT headers & ORY on my LS1 car in my back yard with hand tools/jack stands. Doesn't take a rocket scientist. Single cam is much easier than 4 OHC's