The nice thing about the heli coil is it will not strip ever again. You can anchor them in with some lock tite, and once they are installed, you will bust the head off a bolt before you strip the helicoil, honestly, we tested it in tech school. I work on small engines, and one would be surprised at how many home-jobbers over torque the steel bolts or sparkplugs into aluminum blocks. Heli coils are really quick to install, and they last a lifetime. The only tricky part can be when busting off the insertion tang. Sometimes they are stubborn and mess up the coil, but it's only a 50 cent mistake anyway. When I last had my aluminum intake off the car, I took the time to insert heli coils into the 4 carb bolt holes, even though they were not yet stripped. I never thought of the distributor clamp down hole, but next time around I should coil that one too.