I’m looking to build a Buick Roadmaster as a sleeper project. I’m looking for things like: lower gears, limited slip, upgraded suspension, etc. Is there any special that I should be looking for? I know for a fact that the Buick Roadmaster Estate wagon had an upgraded suspension when they were equipped with trailer hitch. Is the same true for the Roadmaster sedan? Is this suspension any better than the suspension system used on the Impala SS and 9C1 special service Caprice? Thanks in advance for any help!