Daytona Twin Tec here with no problems. Works with single or dual fire, works with or without voes, will work with your kick start, adjustable rev limiter, you can set the advance curve too. Pretty solid versatile setup
My indy recommended buying the "external" module that mounts on the frame neck or under the seat, not the one that is combined with the ignition pickup in the nose cone. He says the heat in that nose cone is not a suitable environment for the ignition module and it will eventually toast it. I heeded his advice and have been trouble free so far.
Edit: hmm, according to the website the "external" module is for 1990 and later and only the nose cone module will work for your 85. Dont know why though??