To adjust for caster- you have to have the camber plates orientated canted (my wagon thread shows a pic of what I'm talking about)- in the "normal" position they only add (or subtract) camber.
If you have camber plates up front- you won't need camber bolts in the rear IMO- they will be in the -1.5ish range and if your getting -2.0+ degrees of camber up front- no need to lower the rear camber- and it's one less thing for them to mess w/.
Insure the plates are maxed out (and caster cross is close to 0) and have them adjust cross camber w/ the oe bolts.
If you have sedan your front endlinks have a small allen head in them that has to be "captured" or they won't come off- it just keeps spinning).
235 width will fit w/ the sedan no problem- it may necessitate rolling the fenders w/ a wagon.