Get the wiring diagram,but remember you need several circuits that won't be in there. You also have a voltage relay which sends power half the way around the engine compartment and also hooks to the horn relay. You're probably going to used a newer alternator which needs less circuits,HEI,which needs a heavier gauge non resister circuit,electric fan etc. It pays to buy the factory type wire ends and the special crimp tool for them. This way llthese extra circuits can be inclued in a harness abnd run through the dash connecter with no extra holes drilled. Hank