When the car was first built, the person who put it together set the fuel pressure to about 8 psi. At my first autocross, I ended up flooding the carb on the first turn 3/4 runs. After that incident I turned the fuel pressure down to 6.5 psi as the youtube video on tuning Holley carbs I watched said 7 psi MAX. I think I may bump it down a little more (5 psi-ish) as, like you're all saying, it seems like its running a little too rich.
Adjusting fuel pressure is not the way to lean out a tune. Too much pressure can push fuel past the floats and through the jets. Once you are below that threshold [7psi], you need to be adjusting idle mixture screws and jetting.
