You'll need the castor angle setting to suit your needs- or you can measure the wheelbase and correct either side to suit. I run as much castor as possible without my wheel fouling the arch, as the turn in is much sharper and the steering more direct. An increase in castor will make the car wonder more at speed- it's about finding the balance.
If you don't know what a good strarting point is, I suggest you measure the wheelbase of you car (side to side) and then use the subframe to correct the differance, any change in castor will knock the toe out slightly, but once you've found a castor angle right for you, get the car tracked up for toe too.
GAF2 has expressed an interest in one of the stage 3 frames as has yourself. When I'm infront of my works laptop this weekend I can write this down and PM you for a holding deposit.
Anymore questions please ask
Cheers
Pete