Here's a front bracket made for my 2nd gen Firebird. It bolts between the beefy front bumper supports near where they attach to the frame. The eye bolt threads into the center where the original splash pan bolt was located. The rear tow hook is a long eyebolt that screws through the rear framerail, reinforcing plates, and large nuts welded to the plates that are welded to the rail.
The rear plates you showed would be better for trailering than track days as the tow guys at the track probably won't go under the car to find them. If you're up to the axle in a sand trap they surely won't go looking. The idea of the hooks for track days is to make it as easy as possible for the recovery guys to move the car without any further damage even if you aren't there.
When designing a tow hook system keep in mind how much force it takes to pull a car free thats up to the floor pans in a sand trap. Better to overbuild when it comes to tow hooks on "pretty" cars. I doubt a single bumper bracket on a 1st gen get can take that kind of stress.
