Forget what the front underneath of a Camaro looks like, but on my shop made air dam(s) I used to have on my el camino, I mounted the front to the radiator core support, which had 3 holes from factory for air dam mounting. Had angle brace behind the front v-area, no bracing in rear. My sides of air dam fit against lower fenders & had a tab flange in the wheel well area for 1 screw. I don't think you really need turnbuckles with a nice heavy airdam with sides like you built, you're not going to adjust the angle anyways, which is the real purpose of turnbuckles. Looks nice by the way.



Here's a pic of my (temporary) air dam I had for a few years.