99 mustang

Hello, new here so sorry if i mess something up lol. Anyways, just got scammed out 800 dollars for a 99 v6 mustang that apparently just needed an alternator, radiator and battery Replaced all those and when the car started a deathly rattle started from inside the car and the whole engine block...

My cheap black insert on the hood of my 99 Mustang keeps popping off from slamming the hood down - what is the best adhesive to re-affix this properly? Or any cool mods that can be done in the space?