Fanus, the easiest way to determine if castor correction was done is to take a look at the bushes. If they are black, they are standard rubber. If they are some other colour (yellow normally) they are Polyurethane and thus probably correction.
Castor is what is responsible for "self centering". In other words, a car with a reasonable amount of castor tends to go straight down the road, whereas a car with less castor will require more steering input to keep it going straight.
Of course, as with all things castor also has a drawback. More castor means more steering effort.
On light track cars it is common to use much more camber. On this car: viewtopic.php?f=65&t=5283&p=59102&hilit=birkin#p59102
I used 7 degrees of caster.
The result was that in a spin, one could just let go of the wheel and the car would sort itself out. The other result was that a 7-lap track session left me with sore hands and forearms...
Mag ons ons kenniskry met lekkerkry aanhoukry.