woo hoo! It seems to be fine!
I decided to take Master Tech's advice and just go drive it around and within a few seconds of starting this time (which is the 3rd start since the head job) the noise went away!
http://youtu.be/A3Is2woCgJ0I drove it for several miles and got it up to 60 or so - everything seems fine except that it's idling a bit high... but I haven't adjusted the timing so that might account for that.