aerohead: thanks again for the angle measurement. I got around to trying it myself, and I'm getting about 18 degrees too, if not a little more. Here's a better profile pic.
I didn't get much work done today on the car because of all the mosquitoes swarming me, but I did get some 1/2" thick "extra durable" foam tape that I placed along the top of the headlights and grille. I also used some "goop" to fill the large gaps at the bottom of the headlights, and caulk around the other edges of the headlights that had gaps.
Next I'll be templating the grille blocks in the ever-popular cardboard. I picked up some big hunks of it from a nearby grocery store. I asked, and they were happy to oblige.