Manson copied most of his vocal effect style from Ogre of Skinny Puppy. A lot of that sound is compression set to "SQUASH" levels and subtle analog overloading of the mic/mixer.
To achieve those types of sounds I rarely use distortion myself.
Trent Reznor was fond of the Zoom FX procesor (I forget which one) and I wouldnt' be surprised if POAAF and TACS era Manson used it as well--seeing as Manson knew jack about recording at that point in his career and relied on Reznor to make those decisions.
Admittedly a lot of Manson's performance is attitude and the old-fashioned lungs work out.
Ogre in the 80's used
the Lexicon PCM41 delay unit, with live twiddling, to achieve many signature SP sounds. You can see this in the "Ain't It Dead Yet?" video by Skinny Puppy.
If you are going to utilize digital clipping I HIGHLY HIGHLY SUGGEST being very careful. If you have to do it this way try this--record the vocal normally and experiment with software amplification or hard limiting to clip the vocal. When you get it sufficiently clipped save the file and then reduce the amplitude--you will keep the clipping effect but you will not be clipping.
Trying to mix a song with the vocal line clipping like a MOFO would be a pain in the butt. Don't try it--it will probably sound like utter rubbish.
So to review: record it normal, clip it in post-production, reduce the gain level after you clip it to make it more manageable to mix with.
Hope this helps some.