I have a 93lx 4cyl mustang that I converted to a 302 carbed car. I have the msd billet distributor and was wondering what spring do I use for the advance for my app? I have a holley 600cfm, X cam, E7 Heads are port matched, Msd 6al, Msd coil, Shorty Headers. There is more stuff done to the car but no need to mention. So if anyone has some knowledge with these dist please fill me in.