You almost have to start with a complete type II ignition from a yard de junque because to convert from Magnavox to type II Delco Ingition you need the module, coils, plate, and all of the bolts/screws to do the changeover and since you can't very well test it in the yard, it generally comes under the "50% of all used complex electronics fail in the first week".
Good news is that if you have the complete assemply, it is literally a "plug and play" replacement for the Magnavox which then makes a good spare if something unfortunate happens.
Another issue is that the shop testers such as at AutoZone have a bad habit of passing as good a module that will not fire reliaby in a car (is being worked on but another story, the people at Wells are being very receptive).
Incidently the Magnavox is not a "type I", that is the Delco ignition used on the earlier C3 3800s like the Grand Nationals, with a single reference pulse coming from the crank sensor. The "type 2" designed and still being used in 2004 is for the P4 system with dual pulse trains (why there are two interrupter rings on the harmonic balancer and three magnets on the crank sensor).
Of course the Delcos all have three individual coils while the Magnavox has a single triple coil pack.
And for super obscurity, the first time I saw one coil firing two plugs was on a 1960ish Honda 150 "Dream". Worked to well over 10,000 rpm.