[David Hodgson]

Pete
Daves right about the caster and toe settings. When I got mine on the road I had it set up with conservative settings like a sedan and it behaved well on the road, I then set zero toe same caster and a bit more neg camber for track work. Very responsive and less understeer on the track, but diabolical on back roads.
Increasing caster will have two effects, first as Les says helps straight tracking, and also exaggerates neg camber on turns(leaning in at the top of the wheel).
Zero toe will aid turn-in response by increasing toe-out on turns, but can unduce wandering in straight ahead, so keep some toe-in.
Exact settings will vary depending on what donor front end as kingpin inclination and control arm angles vary on different makes.