70 GTO Suspension Packages

[heavyd403]

Hello all,
New to both the site and to classic rebuild world. I just purchased a 1970 GTO, it is a well optioned car from factory, 400, THM-400(M40), front disc brakes(JL2) with vacuum power(J50), 3.90 Rear end(GU8), Posi(G83). I would like to upgrade the suspension to allow it to be a badass weekend driver that is diverse enough to play a little harder when I need/want to. Not really wanting to do a race ready type of thing, just want to have a late model feel with an aggressive stance. Unfortunately the body is dismantled prepping for paint so wont be able to measure ride heights before and after each part. Any help with a complete package idea as well as whether I need spindles as well as spring packages would be appreciated.