If you don't want an eyesore like you stated, just leave the whole thing alone.
Take a good look at that bumper, its been repainted at least once and with lacquer primer and could be lacquer paint.
In other words the paint is coming lose from the primer and its stripping time to do any good paint job.
Forget the areo can stuff.
Value of that year vette would make it questionable to put that kind of money into a paint job that would be required to strip it so it would look better if you left it like it is.