First off camber doesn't cause tires to wear toe does. Second how do you know your rear suspension is homosexual?
As for pbm stuff it's pretty much all I use I have No experience with their rx7 parts but there stuff is top quality for s-chassis.
Ok I will give you a real answer.
Stock will work just fine and anything bigger will just have a better pedal feel so what ever you can get the cheapest is what you should get if price doesn't matter 17/16 z32 master is best with a auto s14 booster will have the best pedal feel
i have head good things other than they take a while to use. always seems like a challenge to get an alignment i may have to finally break down and get one
I have a commercial address in west palm that I don't mind you delivering it to though its pretty far from you. But I don't have any help past that. I have medical stuff delivered that is about the size and weight of a motor and usually cost me about $700-1200 I know they use frieghtquote.com or...
I would check the axel your car is so low I'm sure it's putting some stress on it when it has weight on it raise it back up a little and see if it helps something may be binding
If the bearing is bad enough you can see it wobble you should easily be able to move it in the air.
Make sure the four bolts that hold the hub to the spindle are tight