First of all I have to ask, why do you want a non-torsion-bar front end? You can go pretty far handling-wise with the stock setup (over 1.0 G in turns) and all you really get with a coil-over front suspension is more room for headers and much less weight. But anyway you'll either have to get conversion mounts for your /6 K-frame or find a V-8 one from a donor car. I'd recommend getting a '73-up V-8 K-member along with the front suspension components and brakes, bigger aftermarket torsion bars, a good front anti-sway bar setup, and a rebuilt firm-feel steering box. The last three things you can get from a place called Firm Feel, Inc. which specializes only in chassis/suspension upgrades for classic Mopars.