speaking of which(gear reduction starters)..
A couple of hints. When you hook up the starter(after bolting it to the engine) make sure you do not get a flash of spark by hooking the wire to the major post.
Ideally you should disconnect the battery when working on the starter. However, the wires and clearance on the starter on a 6 gives plenty of room.
If you do get a spark when hooking up the juice(either at the starter or the battery, whichever is last to hook up) STOP!
I've seen two starters in our British Car Club members cars in the last couple of years come shorted internally.
Take off the end cover and you can see the main contact, should be installed and not touching the body. If it is touching the body, loosen the bolt and reposition it properly.
Later on down the road, after many many starts when you go to crank and this starter doesn't go to your friendly Napa store and get the Hitachi starter contact kit. Used to sell for about 16 dollars. And it can be installed easily by anyone(even you cuz, much as you disclaim mechanical ability).