ballast resistor

so i am sure this has been asked numerous times, but here i go (again). I put a 6al in my 71 duster, removed all the stock wiring except the brown to the red msd lead and the one other i cannot think of off the top of my head. my problem is that the engine starts but will not stay running. i know why...the coil is not getting power with the key in run. i know there is a coil power wire for "run" that i can jump to the brown wire under my dash, but i dont know which one it is, and the schematic is a little difficult to follow, looks like j2a dark blue, but i am not sure.

thanks for all your help fellow enthusiasts
-tom