I did this conversion for the Ramcharger racer. I had bought a Mallory CD box with a built in Rev Limiter, but ended up using it in my daily driver D-100 with a rebuilt '74 dist with a vacuum can (the original '87 dist did not have one). So now I needed an ignition for the racer and went with the designed2drive.com piece for the RB electronic dist. I recommend you strip the dist down and tap the mounting holes from the inside, as the 10-32 NF tap will go straight that way. When you put it back together, clean and lube the shaft with some light grease first. It is incredibly easy to do , better and cheaper than any Mopar alternative from the factory, no ballast to fool with, one 12 volt wire to the dist and the E-coil, etc.