What is wrong with this picture?

You can't install back up lights with the bumper in place.
In the 63 and 64 Chryslers, there isn't enough room between the bumper and the bumper braces.
So this nicely aligned bumper (which took a while to do) has to come back off.
Some days the supply of curse words is insufficent to meet my requirements.

Bumper alignment. Note how the bumper point matches with the trim.
When first installed, the point had a pronounced tip downward.
Partial shims between the bumper and the brace corrected that.