trust me he's know about getting performance by shortening the slots, many guys will tell you he was the smartes mopar guy they have ever met, ether he didnt think the performance gain was worth shortening the slots or he was just being lazy and didnt cause that man knew so much about mopar, he had a 70 plymouth cuda 440-6 pack car a 71 cuda 340 car and a 70 roadrunner 440 4 barrell car and a 70 super beed with a 440 he had been around some many mopars for so many years raced them worked on them you name it.
