I removed my single leaf springs and installed the Hotchkis four leaf sport package on my 67. It is suppose to lower the rear of the car 1 to 2 inches. Also installed Eldelbrock performer IAS schocks. Now when I hit a bump the rear end or something hits. It also rides very stiff in the back. Do I need to have shock extenders on my shocks? I thought this would be a great upgrade to my car but sofar it's not. When I bought the car it had these big home made shackles that jacked the rear end up and looked like crap. Would putting a slightly longer shackle help with the hitting on bumps? I also put on the Hotchkis subframe connectors while it was in the paint shop but the problem was befor the connectors. I want a lower stance and a smooth ride. Any advice would be nice.