Ok, here is how it works. When you lower a car the a-arm is higher in its swing so naturally you will have more negative camber (the upper part of wheel is in further then the bottom).
The stock setting is -.8* camber per side. With a lowered car you want it around -1.0* because it wont get much more negative on its travel since the travel is now shorter.
I cant get mine less then -4.2* negative which is WAY too much negative camber and would wear the inside of the tires very quickly.
Castor is how much tilt the strut has in relation to the front or rear of the car. More castor reduces wheelbase and negative increases your wheelbase. It should be 3.8* stock and I want mine at 3.5-3.6 to help with tracking. We cant move it lower then 4.8 so again that is way too much.
I can make the car track straight with no pull at all but the settings would cause the front tires to wear fast. The reason its off so much and cant be set correctly is because the K-member is tweaked and the passenger side a-arm is slightly angled because of that. You cant see it with your eye cause its so small but its there.
You should have your car aligned and I would bet your front camber is -1.4 to -1.8 because the stock plates dont have enough adjustment. What that will cause is your front tires to wear the inner edge quicker then the rest. -1.4 is great for a track car but a hair too much for a street car.