Thanks, Bill. Here are the pictures.
Here'* the UIM after returning from the machinist. Note that at .875, there was one small breakthrough into water. I stuck a paper clip into the hole to make it apparent.
top view of first photo. I think instead of reaming the manifold, the machinist decided to ream me. Note that it'* a bit off-center. About .015, I'd say.
My dirtball sleeve sits atop the upper, ready for installation. I used some #320 wet-or-dry sandpaper to rough up the hole a bit to give the JB weld some tooth for good adhesion. Wound up with a very light press fit.
All done. Note that the sleeve sticks up into the airstream quite a bit. This is for the cooling effect by the rushing intake air mentioned in previous posts.
Next up: Get some gaskets, get GREASY!