As far as I know:
-LS = 31-36psi at idle
-GS-R = 39-46psi at idle
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38psi is the stated fuel pressure on the B16A when it leaves the production line.
My setup is opposite of yours I have a B16 Block with a GSR Head
I "should" be running 43psi
*Remember its better to run a little rich then a little lean
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Your engine is not a muscle that gets stronger as you work it harder.
The harder you work the engine, the faster it deteriorates.