Hi Joe -
My car came from the PO with the Mopar electronic distributor, and the electronics box (orange) mounted forward of the radiator.
I "upgraded" with the FBO timing advance limit plate to be able to run max timing at 36* BTDC, and keep an idle timing at 18* BTDC.
I will get you some pictures of the hardware (Dizzy, Electronics Box, and Home-Made Timing Tape) in a following thread. Here is pictures of the inside of the distributor (with the rotor / reluctor removed) and the FBO timing plate.
The way it works is, you select the total "delta" mechanical advance you want (in my case, 18*), and you install the limiter plate inside the distributor, by aligning the 18* slots on the counterweight. Then, you set your max advance (with the engine warm) to your desired (in my case 36*).
Then when your engine goes to idle, the mechanical advance is limited by the plate to the delta (36* - 18* = 18*). It seems to work well.
Not sure if it works with a points-type distributor....
Regards -
Rocky