1. Did squares ever use a bracket that bolts to the front of the starter on one end and the side of the block on the other? My '76 corvette has one, looks like this, but I don't think squares used them? At least not the later ones? Other GMs? Why did some need it and not others? 2. How long should the bolts be? Should the serrated part of the bolt stick out past the starter's mounting flange and into the block? Or should it only be threads sticking out? 3. Is the "R" terminal needed for any electronic ignitions? Correct if I'm wrong but I think it was a holdover from points-type ignitions? I don't think it's used on my '76 HEI, and I know it wasn't used on the '91. 4. How hard is it to replace the drive gear? 5. I've got clearance between the pinion tooth and flex plate tooth that allows a 14 ga solid copper wire, but not a 12 ga. Sound OK? The reason for these questions is I'm using a much older OEM delco. I think it's '72 vintage. Everything bolts up and I know it works (I've actually started the engine with it when I test ran it) but there are some subtle differences between it and the one I had on originally. And there's a little bit of damage to the solenoid, there's a hole in the plastic where the "R" terminal is supposed to be. Considering a new solenoid for the '72 OR reusing the '91, but if I do that it will definitely need a new drive gear. Ever since I bought the burb four years ago there was bad gear clash when cranking. I tried shimming it multiple times to no avail. A few months before I pulled the motor I usually had to turn the engine a few degrees to get it past a bad spot to start it. Right before I pulled the motor I couldn't start it at all - good timing! When I got the engine out I checked out the FP - toast with multiple teeth gone. Trying to do everything right this time to avoid these problems.