I've got a 347 that runs about 10.5:1. It's on the edge of pinging at wide open throttle. If I run 93 octane gas and crank the fuel pressure up to 42# it runs great. I want to put the zex kit on, but I'm worried I'll do some piston damage with out any type of timing retard. Which ignition would anybody recommend? Any help is greatly appreciated.
