Ok, we have a newbie to the 5.0EFI..... first of all, try caps off.
A chip? Why? Ummm, first of all, you don't need any custom stuff done. This is not an OBDII car, this is EEC-IV, and it adapts and is not set with the strict limits of the OBD computers. Yes, the newer cars benifit greatly, but not ours. The A9L is extremely adaptable, and will do more than what you need. Why do you think you need injectors upgraded?
You can have this done, but I don't know what you expect to get from it besides less money. In the mean time, try advancing the timing a few degrees, I am running 15* initial and using 93 octane.