I know the bushing will over flex when set in the air but, I'm not sure about ability to affect ride height. I've never replaced a bushing and tightened unloaded. You can put the car on ramps and loosen the bolts a bit, bounce the car and retighten.
Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.