i thought i'd contribute my 2 cents to this after my setup that i nailed last night and my thinking and the vids i used to help
first and foremost, there's a couple of great vids on youtube where a couple guys go over the same 3 pedals and order and settings, check these out
they have the settings slightly different i believe and activate/de-activate pedals at different points, but both achieve the tone. One thing i found key from these is both guys had the tone on their big muffs all the way dry. I was always under the assumption that the tone needs to be maxed for the trebly sound, but in combination with the wah it didn't make the creamy explosive WAAAH that cliff does so well. I've been making this mistake for years and now i'm glad i finally made the simple switch. another plus with having the tone all the way off, for my tastes i don't have to switch any pedals on or off when going from the rhythm to solo sections. The big muff with the tone set to dry and sustain on max gives that really cool distorted tone that he has from ride the lighting and in some ways master of puppets, he used different guitars on each album so that's part of that. Now when going into the leads, just use the way and suddenly the creamy distortion kicks in so no dancing on pedal boards!
The wah behind the muff is key as well. Both guys use the boss cs-2 compressor, i don't have compression in my chain and i feel its still close enough, although i'll try it one day and see but for now i'm very satisfied.
For the record, i am using a russian big muff that i just got repaired, it's the black one, a dunlop wah bass pedal, not the morely wah and they are going into an orange bass terror 1000. So even with different gear it's still possible. I used my rickenbacker 4001 and the big thing for me was to use only the bridge pickup. Using both pickups together the bass sound of the neck hits the distortion way too hard and it just becomes a very intense fuzz instead of smooth distortion, so there's no definition so you can hear it even when the wah is engaged.
hope that helps people for the quest for the glorious CB tone