I'll jump in as Arnie hasn't come back yet...he's really the best chap to speak and will prolly add something
Below is a fast road geo print out for a classic. The set-up works very well. There is a fair amount of toe-in (front & rear) which can feel slightly disconnected at slowish straight ahead driving, but comes alive when pushing on and is what I use on my classics.
Note the amount of castor which is a fair bit for a classic (you want as much as possible). This was achieved with an ALK. If your Impreza is a New Age you will have this amount of castor anyway (see Arnie's tips for getting more castor below)
Note: Toe settings and measurements for both below are toe-IN
Here is a New Age print out with more castor. The camber is a little excessive and perhaps one and three quarter degrees may be better, but toe-in is the same
