OK - so I had a break in the rain this morning, so I was able to remove the TB during one clear patch, address the ports I hadn't closed off, then get it back on during another break in the rain
Larger port I tapped with 1/8" NPT
thread sealant on plug
tapped smaller port with M5x1, used the snapped off stud from the ignition ballast to make a plug
done
Back in. Ran the motor - don't have the tach installed, however the rpm's felt much more in line. A little low perhaps, so I ran it to normal op so I could check the base setting. With CIS, the easy way to do that is close off the low vacuum tube from TB to the IACV. It stalled out, so base was too low. Opened the idle thumbscrew a couple turns (I had completely bottomed it out) & got the idle what felt around 750. Releasing the tube, the idle motor cycles & the idle rises to what feels like 850-900 range. I will set it more accurately once the tach is in, but it feels good. Motor revs freely & returns to idle.