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Originally Posted by mazspeed
They had the boost reference on the carb hat, and it was running too rich at WOT. When they moved it, that's when they saw better A/F readings. The timing is what you are referring too, spot on.
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the boost reference for the fp regulator
must be in the hat. That could be the dying issue you saw. The reason for this is becuase the carb is seeing extra pressure even when you're not in boost. If you do not compensate the fuel pressure regulator then the hat may see 4-5 psi even when the motor is not seeing boost, and the 6 psi of base fuel pressure you have will now be only 1-2 psi, due to the pressure in the bowls reducing the fuel pressure the carb sees.
You must move that back to the hat, it needs to rise evenly with what the top of the carb sees or you're going to be chasing dying and tuning issues forever. The boost gauge goes under the throttle blades, but not the fuel pressure reference. If it's still too rich you need to tune the carb.
Jody