Need help with spark plug gap and fuel pressure reading

MSP09

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2003.5 MAZDASPEED Protege
Gents my MSP is almost complete and I need to do a few more things before it is complete. I need a help with the spark plug gap and what NGK spark plug to use. The engine has been fully built and has a bigger turbo; I am running 10 lbs of boost right now. Also the fuel pressure gauge that I have reads 30 psi and I am wondering if that is okay. I have a walboro 255 pump, should I increase the pressure? The fuel injectors that I have in the car are 450 and I am considering using the 750 that I have, would that be a good thing to do? My car really hesitates a lot and I am looking to fix the issue. I know that I need a tune because I am running really rich, the wideband that I have in the car is reading 10.0 all the time. All the help in these matters would be great, thanks.
 
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