Originally Posted by Brad_Haak
http://www.moparts.org/Tech/Archive/bb/62.html

For me to consider them, there would be two key questions to answer first:
1. What do I have to spend to make them usable in the first place (e.g., valves, seat & guide work, milling)?
2. If I want more than as-cast performance, how much do I have to pay to have someone do enough porting to reach my goals (assuming I can't do it myself)?

I wouldn't want to put much money into 60 year-old castings in this day and age...

2021 Challenger 6.4L Scat Pack 1320
100% stock: 1.680, 11.894 at 113.75 (DA 175 ft)
weight reduction, wheels, tires, Hellcat air box: 1.661, 11.686 at 115.97 (DA 710 ft)

1973 Challenger 452 ci street/strip [2008]
pump gas, DOT radials: 1.454, 10.523 at 126.44 (DA 514 ft)