On mine I removed the black "adapter" where the wires connect. As stated, there is a second place under that adapter where the factory wires can also connect to.

I ground on the tip of the nose cone. And I also ground on the case where it faces the flexplate once mounted. I was using an aftermarket flexplate that allowed me to use an unweighted 318 torque converter with a 360. That part of the case was touching the flexplate and would not let the starter mount correctly. When I hit the key, you heard a lot of spinning but the bendix drive could not extend because of the mis alignment. My grinding took care of that. maybe something to look at on yours. I didnt see exactly what was happening with mine until I had someone crank the car while I was under it watching the starter.

roe