Here are two places that offer various packages for your needs.
http://www.suspension.com/chevy,fullsize.htm
http://www.springworks.com/auto-bushings-chevy-buy.html
Is it worth it? Am I the only one here that has put money in a car just because I liked to drive it? Not everything is for investment, right?
Depending on whether you plan on keeping it or flipping it there obviously is a difference on how much you can spend before you take a loss. The BB big cars are fun to own and drive.
I had the motor mount cables on my 65 Impala and 66 Caprice.
Good Luck !!