...and, I also should include Holley R-6193A and R-4735a were both used on 383 Roadrunners with "fresh Air Intake" systems. I guess that means the Air Grabber hood option.

and Holley R-6191A and R-4668A were both used on 383 Roadrunners with "heated air intake" systems. Not sure what that means unless they are talking about a hot air stove before the air cleaner.