I have a 383 stroker edelbrock heads, cam, intake and a 150 shot of nitrous im wondering what size injectors i should use for this setup.

 

make sure you go big enough for that 150 shot, I couldn't tell you how big to go, but I'm sure a tuner could.

 

That only matters if it's a dry shot, wet kits provide there own fuel.
Is the 150 shot dry, or wet?

 

Take your NA (no nitrous) flywheel HP, and multiply it by 0.07 That will give you the smallest injector you should consider. Generally, the LT1 dry kits raise the fuel pressure when you spray, so you size injectors for NA HP. If you have some other kind of dry kit, you'll have to let us know how it works.

 

I have an edelbrock dry shot and it has a booster fuel pump.