I looked at both MSD and Pertronix and I can't see any big advantage one would have over another. The Pertronix costs less and looks more like the stock Ford distributor; black cap and female connector ends on the cap. So I went with the Pertronix.
As to running a CD box, you can do so with either dizzy, but if you're going to run a AL6 or some other box that has a rev limiter, you don't need the Pertronix III, may as well save a few bucks and get the Pertronix II. The main difference between the III & II is that the III has a built in rev limiter; no need of two rev limiters.
As for the vacuum advance Mallory; I have a new in the box Unilite vacuum advance duel point distributor sitting on the shelf. So I know they made them at some point, don't know if they still do or not.