I would doubt that your real suspension movement in normal driving conditons will be 4", probably more like 2" to 3". 3 to 4 degrees of camber gain in anything less then all out road racing competition would be negligible as long as the bumpsteer remains a zero throughout the full range of travel...... We played with camber gain and roll centers a lot in the circle burner cars, but as long as the settings are reasonable they don't seem to have much of an effect on street driveablity. Bumpsteer on the other hand, can turn a pleasure trip into a nightmare! With the camber gain as you describe it, what caster angle will you be adjusting into the front end? It's been my experience that caster and bumpsteer settings are far more important on the street then anything else in the front end geometry....