Larry, I believe your color codes on the main harness will be LEFT: Light Blue - front and Yellow - rear, and RIGHT; Dark Blue - front and Green - Rear. At least you can find out if your body harness is ok.
Chevrolet has used Packard brand electrical connectors since before forever and NAPA stores usually have them in stock. Since I don't have a factory type crimp tool, I solder everything and use heat shrink tubing.
Best wishes,
Les
