Next step, THROW AWAY FINE PITCH MOTOR-keep spacer! Sorry, but maybe you can sell to 87-92 square body guys. In any case, not usable here. Fortunately, appears can be purchased for $23 shipped.
https://www.amazon.com/Dorman-742-15...Motors+742-150
The motor we need is ASTRO VAN 85-05 9 tooth.
http://www.carparts.com/details/Chev...B&gclsrc=aw.ds This one is $19.
NOw attach spacer plate to 9 tooth Astro motor. I used screws provided, not sure which went where, I needed to drill motor holes little bigger to fit screws.