Thought I would update what happened to mine. I had 2 issues but they have both been resolved.
1) First issue was the Liquid Filled Gauge
2) Second Issue was the Rear Float was filled with fuel
I changed out the floats & needle and seats on both bowls & Jet extensions at the same time.
Both issues have been fixed. FP is ROCK STEADY at 6.5 PSI using 1/2" Feed and 1/2" Return lines with the Walbro GSL-392. I did not move my PF regulator. It is in the original location.
I am using a Mallory 4307M Regulator that is Boost Ready.