Over the years, most noises like this I have found to be either pedal it crankarm related. In this case, tightening them didn't work. I was pretty confident of the bottom bracket since I'd installed it myself. I poked around for a couple of hours without success. I removed the cranks and pedals and re torqued them, checked the pedal bearings, etc -- no luck.
On a whim, I decided to see if there might be a crack in one of the chairings, and when I went to remove them, I found a couple of the chinring bolts just finger tight.
I took them all out, cleaned them and the mounting holes, and reassembled them being careful to torque everything properly.
Click is gone.
Just one more thing to try.