Yes, 110 or 112 lsa, 220 @.050 is too small for a 383, your dynamic compression will be higher than your static, with iron heads yikes. I mentioned the 474 because that size lift & duration requires nothing more than a spring upgrade. You'll still have massive torque. I ran that cam with 2.76 gears with no issues, I did upgrade to 3.91 because I wanted to get going quicker. The purple shafts maybe old design but the last time I rode in a car with a purple shaft it made me smile. Over .500 Lift isn't necessary with a cast iron head. Duration is all you need to focus on. Howards has a 484 or 488 with several different durations, I think 3 different cam grinds.
