Unless the spec just changed the meters on all the latest engines is a 70mm unit.
If you're after something with really good flow capacity and don't want to stuff around look for the Pro-M 77 meter through a yank supplier. It'll cost you around US $400 but its a well designed unit. Unlike our 70mm meters this Pro-M model has the sampling tube built into the wall of the meter so there is considerably more airflow.
If you want to see ads pick up a copy of 5.0 Mustang or Muscle Mustangs & Fast Fords from a newsagent (it may take some looking).
I do agree with you (anakha) on that MAF as I have read in my new 5.0L bible called '5.0L Ford Dyno Tests". I suggest every gets this book. The reson I asked cause if I can get a good MAF from here at a good price it well it's easier than importing one.
Although a mate and I are importing some suff soon, I was seeing my opyions first. I ran Ford today and they couldn't tell me any dimentions. I wanted;