Awesome A-body air dam for under $30!

I have a spoilers by randy on my duster but my barracuda doesnt fit the criteria as the lower valence outside edges are greater than 1/2" when a straight edge is placed horizontally (too much angle/height gain). Im with @famous bob in that I would like to see more hacks/suggestion/pics/cooling numbers from anyone with a 7/8/9 barracuda.