Going to install 30lb injectors with a calibrated mass air bullet 75mm, will I run into problems with the stock truck computer , mods now are : E-303 cam, GT-40 heads,underdrive pullies,dual electric fans,longtube headers X pipe true duals,MSD-6AL/TFI coil,F.I.P.K with K&N cone filter or will I have to have a SuperChip burned ???? Now I am running Lean, indicated by White colour plug tips and exhaust valve faces.

 

You sure you're not running out of fuel from the pumps?

 

If you're currently running stock 19# injectors, that's why you're lean. 24# injectors should be enough to support that engine, you don't need, or even want, 30s. Depending on what year truck you are running, the stock fuel pump might or might not be able to keep up with a set of 24s.

Any change in inector size is going to cause some drivability problems and probably some emissions issues as well because of the difference in pulse width/response time of the bigger injectors. Best to get your EEC re-flashed, a chip would be an alternative.