What I'm going to recommend to you is the same thing I did to my '71 Sebring.

Leave the stock springs and T-Bars under it. Makes for a great soft ride for everyday to-work trips, and across the state and such.

Get some heavy duty anti-sway bars. They will help GREATLY to get rid of the boat-leaning around corners.

My car had a 318 auto, plenty of power for daily driving. Yes a big block or stroker small block would have been better, but I never did install the hemi, or 440 that I wanted to get.

My car did great driving, and even on the 1/4 mile roundy round track one night.