I would drive it 'til the springs come through the floor of the trunk. Looks like the guy did a "Lakeland Lash" on the trunk floor. Tossed a plate over the hole in the floor and covered it with undercoating. Shoulda used an old pizza box.
Personally I think it looks pretty good. A little hard to get excited about that 318 in there, But still pretty good looking. I drove a 78 fury 4 door before with a stock 318 and it was a little disappointing to say the least.