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If you're boost gauge is getting it's pressure reading from the brake booster line it's showing you the air pressure in the intake manifold and not pre throttle body in the intercooler which will be a little higher than in the intake manifold because of the pressure drop post restrictive stock throttle body.
You didn't say you have an aftermarket boost gauge taking it's reading post throttle body so people figure you're talking about the stock boost gauge that takes it's reading from a questionable accuracy sending unit pre throttle body.
Seems to me the motor will always make the most horsepower with the single throttle body butterfly open all the way as long as AFR and timing is correct regardless of what your boost gauge displays.
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