The driver side had a similar repair.
Pinching the frame rail for the Detroit Speed tubs to fit.
After cutting out the previous repair, it was determined that a replacement strip should be welded in place of the old repair. This would preserve the outer wheel house, and this time, it would be metal finished to blend in and the repair would be undetectable.
Check out:
V8 Radio Podcast: https://www.v8radio.com
V8TV YouTube Channel: https://www.youtube.com/user/V8TV