Drove the car and it really seems to have quite a bit more power from the seat of the pants feel. I had initially re-used the fiber gasket because I liked how thick it was, but it really hadn't come apart clean, so the vacuum leak at the manifold wasn't surprising at all. I replaced it with a new thin tin one from NAPA and it still has a little vacuum leak issue, which isn't surprising given I never had the intake flange surfaced, but it idles down to 600-700rpm in neutral so it's not too bad. I'm going to pull the intake one more time, it only takes about ten minutes since the bolts are easy to get to and it's only the intake, and "Right Stuff" the intake flange and see if that cures it.
I tried using a high speed datalog to see if one cylinder has a greater leak than another, but no such luck. The only thing that came out of it was it "appears" cylinder three pulls the most vacuum, but is likely just a result of the vacuum port being right across from cylinder 3's runner entrance.
The for some reason log is read right to left (as determined by as time increased the logged value was to the left).
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"How I learned to stop worrying and love the OHC Pontiac L6"
The Silver Buick- '77 Skylark coupe w/455, SPX, MegaSquirt 3 & TKO-600 (Drag Week 2011, 2012 & 2015!)
1969 Firebird with a turbo'd Pontiac L6 controlled by a MegaSquirt 3 and backed with a microsquirt controlled 4L60e and 4.56 gears! (Drag Week 2018!)