It comes with a distributor gear that is melonized and is compatible with flat tappet cams and roller cams. I hope this works with my hydraulic roller cam since the gear coming out appears to be something special.
There is no external box. The distributor is self contained. After re-reading the instructions I found that you can still run a capacitive discharge ignition box (I guess that means both Duraspark and MSD) and wire it as points/amplifier style ignition. Maybe I will reintroduce the MSD 6A into the mix.
I think the height of the distributor is the same as Motorcraft. You can email or call them for a precise answer.
It also has vacuum advance that is programmed on your phone. Below is a screen shot of the initial programming. The vacuum advance is only a hose connection into the bottom of the distributor and there is no canister or diaphragm.
Finally, you can lock the distributor from your phone as a theft deterrent. Each distributor has a unique four digit PIN that you enter on your phone at initial setup.
