Holley sniper failure, this time its all bad.
Raw (liquid) fuel running through an engine is VERY bad. It removes the oil from the bearings, now your metal on metal.
The gas "washes out" the oil on the rings and destroys the buffer between the mains, rods and caps.
Its a all bad situation when raw gas gets pumped into a running engine.
I recommend the sniper system. In my opinion it was a better choice than FI tech. Customer wanted Fuel injection that "looks like a carb" so Holley or Fi tech basically.
Over pressure should cause a lean condition, the injector cant open. Most likely its a chunk of crap in the injector or a ground fault in the board. (10 to 1 holley says crap in the system but this is a new system, flushed before hooked up and running their filters.