There is a handfull of guys on here running allen kits on 5.4's but I can't recall anyone here running one on a 4.6
I've noticed your posts in the last few weeks and I have even looked in my local classifieds for parts for you with no luck.
I hope you find what your looking for.
Here is a pic of mine on a 5.4 I just upgraded to 42lb injectors and a 90mm MAF I also had to drill and tap the plenum for a IAT sensor. It runs much better now.
I know what a dusty engine bay I've been driving it to work for the last couple of weeks right next to a gravel pit.