A good point. I do have a wideband AFR gauge on the dash, so I can try jetting down the primaries a bunch and see if the cruise AFR goes up or stays about the same... scope
It's an old 4780 (800 double pumper, 2 corner idle) which I already know is a bit undersized. When I get tired of screwing around with it and still not getting optimal driveability, I'll send my twocents to Dom and have him build me the right carb to bolt on and go!

I already know the PV is way off. I think it's a 4.5 or even a 3.5, because I listened to the oft-repeated (and wrong) advice of "half the idle vacuum". Two inches below the cruise vacuum, or at least a 10.5, seems to be a much better starting point from my researches...