Holley 750 not maintaining Idle after installing fuel pressure gauage

[AM.MSCL]

I guess maybe I should mention that the car had been running just fine for 2 years with the exception of issue number 1.
I current have 10 degrees of timing which is the max I could do without introducing lifter clatter at high rpms.
If I remember correctly I had 15 units of vacuum when I tuned it.