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/A3Is2woCgJ0

I 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.
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Warning! Do not sear the top of your neck hole in the molten lactate extract of hoofed mammals.