I have an 85 cutlass and i want to change the body mounts. THe ones on there now are old and i want a better handleing car. are they hard to change do you have to take brake lines off or fuel line? And if i get 4 or 5 ppl to lift up body off frame will the body start flexing? I hurd that the windshield might brake if you are not careful enough. I was thinking of jus lifting the body off the frame like 4 inches and jus slidding the poly bushings in. Just want to kno if it is worth all the work.