Firstly, I think there's good room in gap between the hood and over the cross-beam to make for a wider 'ram' style Cold Air Intake as used quite often on CAI kits for Holdens and Falcons.
One of my efforts therefore may be to draw up an over-the-cross-beam CAI ram-intake that feeds to the standard XR4 intake piping. I might need one version with the standard diameter tube or might also do one with a large diameter tube. Along the lings of this BF Falcon 'big mouth' cold air induction kit:
Lukeyson