the 70mm SVO is still a viable option for the 4.6 since it does flow more cfm over stock (SVO is swirl polished, while stock is not and = 70mm, restricted by various MAF and Intake design factors). The best option IMO is the BBK 75mm throttle body that I have; It's for 96+ mustangs but fits fine on 94-95 tbirds.
Problem is: I had to remove mine because I'm waiting for a Chip upgrade. Throttle Body's and MAFs won't work properly until you program the comp to know they're "there" so to speak. I ran it with it on, and it does flow A LOT more air and improve high mph performance, but for daily stop-n-go driving NOT good. Internally there's much more air than fuel to burn so combustion lag is horrible.
NOTE: for NA engines, 75mm is plenty big enough, and in unison with a larger (73,76,77,80mm) MAF, will do wonders for performance. The best combo would be an SVO 70mm + 73mm MAF, or a more radical BBK 75mm + 76,77,80MM MAF.
for purchase check:
www.cncperformance.com
www.cnlperformance.com
www.bbkperformance.com
www.fordracingparts.com