I'm pretty sure that one uses the lower intake as the fuel rail. If that's the case than there is no schrader valve. You'll need to test for fuel pressure at the fuel filter by removing one of the lines from the filter and using adapters install a test hose inline and then attach your pressure gauge to that.
If the fuel pressure regulator attaches to the drivers side of the lower intake than you have this setup.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
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