Oh the joys of a project car haha. Fresh gaskets and nice bead of rtv should do the job. Things like this just happen so I wouldn't get overly concerned.
As for the vacuum port, nothing wrong with doing what you proposed. 3/8" or 6an will be fine if using it to pull through a catch can with check valve.
The port above the oil filter will also work just fine for oil pressure reading.
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97 T/A Ram Air Convt
Forever dyno queen / 777rwhp 662 rwtq @ 17lbs / 10.2 @ 140
'24 Corvette Z06
17 Sierra 2500HD Dmax
81 Turbo TA
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