About half way down the page I listed a step by step and a TERRIBLE drawing. But it should help you do the job.
Initially I installed mine the same way Longhornmail did his but I kept noticing problems with voltage when my electric cooling fans came on, low voltage. I've since revised the wiring to the schemic I drew and everything is fine. The key is the large output wire directly to the battery or J-block.
http://67-72chevytrucks.com/vboard/s...ght=ALternator