Ah, never work on a bike when tired. I had to grind a bolt off holding one of the timing chain sprockets on, just because I missed a little section about removing a couple cam keepers(?) and stripped it. But it's off, and the damage is minimal.
This is why you plug the exhaust ports when storing a parts bike.
The head looked pristine.
And here are a set of ITBs off of a Yami YZF-R1 ($30 of my $45 budget!)
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. Too big for the engine, but I'm sure any problems with low end torque can be bandaided by proper intake pipe length/size.