Magnum: I know there is ALOT to read on this one. I don't know any of the timing settings except that install mechanic said he set it to total of 36 as recommended by engine builder (muscle motors). I bought the ignition system new about 3 years ago and was using it on another one of my cars with a 360, and it was working fine. It does not have the brass colored shaft, so I am told that makes it the Mallory unit. I have not found out what the other timing settings are. I haven't had a chance to make appt. with mechanic. I want to drive by and when I don't see a bunch of cars there I am going to stop by and chat. I hate to bug him because I know he has people stopping his progress all day. Took a drive by earlier and he was real busy. I have to drive one of my other cars in the mean time. Can't take the shaking and choppy idle. I am noticing more and more times when I go to start it turns over slow the first time then cranks fast and starts. Must be initial timing I guess.