Hi, I want to fine tune the ign timing on the 360 Magnum in the Dart. The cam is a Comp roller with .480/.512 lift and 262/264 duration on 1.6 rockers, Edelbrock 600 carb, accel HEI dist and headers. Mech advance is about 30 degrees @ 2500 rpm. Initial timing was set at 20 degrees with vac...