Suspension upgrades ,the best route

Looking for some opinions and advise. Would love to get rid of some torsion bars and leaf springs, coil overs all four corners!! Rack and pinion steering the works! The platform is a 69 Cuda 360 60over motor plate manual steer 8 3/4 built 904 car . Would like to lose 3" or so in the rear . Budget is in the middle , any particular front end, rear end better then the other? Looking for nice road car package ??