Anyone use a DUI system?

Is the photo below what you mean? I find a price of $369. Cheap Mopar bastards like me can do much better by using a standard Mopar electronic distributor to trigger a GM HEI module. I prefer the later "8-pin module" w/ GM "external coil" found on ~85-95 trucks with TBI (small-cap "computer" distributor). Steal the pickup connector too. The advantage of the 8-pin module is that you can tweak timing with an ECU like Holley's Commander 950 (if desired). If so, steal the knock sensor and module too. Also, the factory cable connects the module to coil and gives a tach output. I am doing so on my slant. Of course, heat sink the HEI module.

You can also use an earlier 4-pin HEI module, but more roll-your-own on wiring. That approach is simplest if you buy a "ready to run" HEI distributor ~$45 on ebay (SB & RB only). I have one for my 273, though may convert it to 8-pin type.