In your other post, Elree Colby 2 links on harnesses. Both of those are exact copies of the factory harness and connectors,and will be the easiest to install, as its basicly "plug and play", no cutting or splicing required. Before getting a harness, think about everything the car will have, as you can order one already modded for a HEI, internally regulated alternator ect...who did you get the harness through and how hard was it? from 1-10 (10 being the hardest)
There are other types of harnesses on the market that are cheaper, but will be much harder to install as they are universial to fit many cars.