engine wiring help

ok, so heres my issue. i have a 74 valiant originally a 318 w, electronic ign and a/c. i bought a ready to run msd distributor that removes the ballast and ignition box. i also am going to run a one wire alternator with internal regulator. just wondering how to wire this up. got a guy that can put together the harness, just gotta figure out what i do and dont need