Oh boy what a question.......
Well it depends on many factors but it is something that you have to work out for yourself it is not a figure that can be quoted.
First you need to work out how high your front and rear CofG are. then this will alow you to decide how much leavarge you want the cornering forces to apply to the RC which will detirmine how far you want the roll center away from the CofG, like adjusting the length of a spanner to undo a nut, the longer it is the more leaveridge it has.
idealy you want the RC to move with the CofG by equal amounts so as to keep your leaverage the same.
once you have all this data you will probley wind that the camber curve for your wheels in bump and droop are awful and will find that you have to make a compromise beween
1) outer wheel control in roll
2) camber change in bump/droop
3) roll center location / control
you will find that the less suspension travel you have the more control you will have over these factors however another compromise then comes into the fray that you require a realistic amount of suspension travel do drive the car on the public highway due to all of our lovley pot holes etc
also consider the effects the KPI and caster have on the geomitary of the outside wheel when the car is steered more KPI will put on more positve camber when the car turns and caster will have the oposite effect.
i would highly recomend you get a copy of
"compotition car suspension" by allen staniforth
this covers all of the basics of suspension design and weight transfer
hope this helps i am awere it is not quite the answer you were looking for but the answer is not a simple of.
if you have any other question of this nature dont hesitate to ask, i will be as helpfull as i can though a little moe detail in the question may be required.
all the best of luck, it is a complicated process designing suspension
tilly
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