Here are PIC's of the final result if my spar ding. As per Dan H. suggestions I started out with a 220 grit aluminum oxide sandpaper instead of a round file and removed all the tooling marks. I then finished the "ditch" out with a 600 grit wet/dry sandpaper to blend it all in. The result was that all tooling marks are removed, the area has a gradual blend to it and I only had to remove 1/16" of spar block at the deepest measurement. My A/P friend and Vans said that this was the correct way to repair the damage and would not sacrifice much if any of the strength of the spar. I now only have to prime the area to finish the repair.
Thank's for all who weighed in.
PS. Vans has it right there in black and white......."Remove the clecoed tank assembly from the wing, and drill all the rivet holes to final size. (Doing so off the wing prevents accidentally drilling the spar)".