Front spring eye height setting.

On a leaf spring car, the instant center is the front spring eye. Draw a line from the contact patch of the rear tire through the IC/spring eye up through the center of gravity. If this is true your car will have zero % of rise. A bodies leaf spring cars never have that. Without scales and trig formula you won’t know where the center of gravity is, but if you draw a line parallel to ground trough the cam and draw a line through the center of the converter might be close to the center of gravity. A bodies have a high % of rise. They hit the tire HARD. Lowering the front spring eye hits the tire softer. Less body separation, less bouncing of the tire. Slo-mo video helps a ton!!