Trying to install new front shocks on a 67 restoration. Are there any tips to compress the rubber bushings on the bottom of the shock to be able to install the bottom rubber, flat washer and nut? Also, the driver's side , the spring needs compressed about 3/8 of an inch to be able to get the bottom of the shock to go through the spring perch. No engine or transmission in the car. I put a floor jack under the lower control arm to try to compress the spring, I start to lift the whole car. Any tips?