I want to replace the front and rear springs and shocks on my 1971 GTV. I've read all the discussions on red springs, yellow springs, spring rates, etc. I know what I will buy, my only concern now is the installation. I have the required tools and aptitude....I'm not sure I have the lifting capability. A document that I downloaded from Centerline says I would need to get the car 30" off the ground to remove/replace the springs. This is higher than I can get with the floor jack and stands that I have. Has anyone replaced springs under their shade tree? Is it really necessary to lift the car 30"? Any other advice / cautions?