I aint no expert, but have never understood why a person needs a phased rotor on a Chrysler big block. I had to clearance my raised port head a hell of a bunch, clock the (fast) electronic dist. in a cetain way, because its based on a short chevy shaft. Then adjusted the dist. drive gear , and lined everything up on number one. Doesn`t make any diff. what location no.1 is , as long as it`s right . ???????????
