The head ID number is located between the 3rd and 4th cylinder on the intake/exhaust side of the head. I'm not positive, but I think you can see the number with the valve cover attached.
The fuel system is still adequate with the mods you stated. If you're working on a pre-96 4.0, you can build a MAP sensor adjustor to fine tune your A/F mixture.
Now, where did you find that cam? I'd like to find out more about it.
99 XJ Cherokee, 2 door, 4.6L Stroker, 5 speed, 4x4, 8.25" rear, 3.07 gears