Hi-I am currently working on a 1972 Demon 340 Mr Norms GSS Supercharged.I have read in various magazine article and dealer ads that Mr Norm had "recurved" the distributor on these cars
Bet he had to recurve to deal with a supercharger. Higher compression with rpm my guess would be more initial and much less mechanical advance. Need to find someone who knows about supercharging if can't find the info about what Mr Norm's guys did.