I have a 2002 mustang gt with a cold air intake, intake spacer, and a throttle spacer with 42 pound injectors and upgraded coil packs I will soon be throwing a cam, tune, and front face turbo hoping to have 10 pounds of boost will I be okay keeping 42 pound injectors or do I need to go higher?

 

LMR has a pretty good chart for your reference, it really comes down to how much hp you're making. And honestly it's better to be safe than sorry, you don't want the engine leaning out at high rpms

https://lmr.com/products/mustang-fue...tor-size-chart

 

With a few extra mods I plan on being around 550 to 600 wheel

 

I'd be more worried about you engine internals at that point