Brendon, I love the magic you are doing with metal on the bird!! I spent a HUGE amount of time reshaping and adjusting gap, etc, so goal wa smuch better than factory, and tight gaps. I had to weld seams, move things around, then grind, then redo a bunch of things, but in the end pays of, so am sure you will be pumped when primer time comes around.
Post up pics of the finished bumper when you get a chance, I am considering chopping mine further for the other project (rear bottom section is semi beat in some areas, and makinfg it skinnier to integrate better on the custom valance (am planning to integrate a 69 maro valance).
Here is the 67 400 coupe pic form a couple weeks ago (still ways to go)
and since you are into 90210 body changes, here is what I did on the 68 vert (Lolla), shaved rear gills, and incorporated 69 front fender scoop insert sections:
not the best shot but close to how she sits now: