If I run the taller F,M,J, spindle do I have to: (mandatory) use the Moog offset bushings?
I have Polyurethane non offset UCA bushings in it now.
It's not mandatory, just like it's not mandatory to use them with the "normal" spindles.
That said, if you're running radial tires (and not bias ply's like factory) I would use a set of offset UCA bushings. It makes it MUCH easier to get the proper negative camber and positive caster alignment that you want with radials. A lot of that depends on ride height as well, it's harder to get the caster to a good positive setting as the car gets lower.
While you don't really need much negative camber for regular driving, adding positive caster really helps the car feel more stable. If you have power steering, you can pretty much add as much positive caster as is physically possible, even with the offset bushings. I have my Challenger set up with +5* caster, and it really helps keep things centered. It also adds a little more resistance to the overboosted power steering feel. With manual steering adding too much positive caster can make the steering too heavy, but with power steering the sky's the limit.
CP has the proper method to get the alignment roughed in, I usually still try to at least have it checked on an alignment rack but I've gotten pretty decent at setting it. If you change too much you'll definitely want to verify the toe in after messing with the UCA's. Caster isn't a tire wearing setting, and camber only gets to be a tire wear problem if it's more than 1* in either direction. But 1* of camber is visible just by looking a the tires from the front of the car. Toe, on the other hand, can cause serious tire wear issues even if it's only slightly out.
