I prefer to check by the throttle body. But unless your filter is plugged you should be close. 18 psi with a stock spring makes me think the spring may be bottomed out. You'll need a stiffer spring for at least 22 psi with stock injectors for the vortec headed 350. I'd also recommend you upgrade to the EP377 fuel pump.
For tuning I'd recommend an emulator so you don't have to pull the ECM each time you burn a new tune to change chips. I use the Autoprom from www.moates.net. When I'm done tuning, I can burn a chip with the Autoprom, install the chip and remove the Autoprom from the truck.
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