Welcome to Stangnet! I'm sure someone that installed one on
there stang will chime in and help.Don't the Mach 1 chin spoiler
kits come with directions though?
no instructions with mine but easy a pie. tape in to place and adjust till you like it. Drill holles, the push in the fasteners.
Took about 45 min from putting up on jackstands to taking it down.
you can line the front of the chin spoiler up with the front lip of the bumper or line the tips of it with the wheel wells, it creates two different looks, and for that part you'll need one other person to help, line it up where you like it, tape it, drill, then put the screw tabs in and tighten, its good to go.
I used a dab of loc-tite just in case, but its held steady for almost a year now. Good luck