Took a look around and only found a generic drawing (looks like it might have been adapted from an earlier year where the rev limiter was attached to the drivers side shock tower. It shows it on a stud and the drawing shared on the 429supersite. On an assembled car and with everything in the way (heater hoses, air cleaner .....) its difficult to find, for me, any clear pictures that would provide a clue to the grounds attachment point on your particular engine type and year. Sorry, maybe someone else has gone through this but I found a fair number of forum post elsewhere that never got responses on similar questions
