Animated performance trends.

[David Pozzi]

I think you'd see 2" dive and 3 deg of roll with a somewhat soft setup. Our Hotchkis TVS 73 Camaro was in that range on DOT race tires.

Get your anti-roll bar dimensions, then click menu item "vehicle specs", then click the Front Suspension tab, on the lower left there is entry for the bar rate in lbs. or hit "Calc" and a calculator pops up to calculate bar rate from dimenions, click use calc values and it will be entered for you.

I'd guess most later 60's GM cars had a roll center height at ground level to 1.5" above it.
David