Yes. My position is: a regular dist with vac adv and mech adv with no weird add ons such as nitrous retard etc, that the mech adv does not change rotor phasing so if you cap the can the RP will not change at any amount of mech advance and RP will be checked by tossing on a cap with the hole drilled in the top then using a timing light to in effect freeze it (which is how RP is checked), that the rotor will NOT shift/move... (I feel like I am drawing up a legal document!). One Moparter to another, you would be betting that the rotor phasing will move with mech adv only and I will cover the bet for ten. (I have PP and I can send a ten dollar bill in an envelope to take care of my end as needed). I just checked the dist in my truck 3 days ago & reconfirmed my position, the rotor did not budge when I revved it high with the can unplugged/hose capped and I was definitely up high enough to be into the springs/advancing. Are you in brother!