Need help locating the distributor

I have a 1995 E-150 5.0L. I need to replace the rotor and distributor cap, but I'm having difficulty locating it. I have replaced distributor caps on other vehicles, but this will be my first time on a van. I've looked under the hood, where the plug wires are visable, but I am unable to follow them to the distributor. I pulled the cover off inside the van, with even less luck of locating the distributor. Any help would be appreciated.

the distributor is located on top of the engine, front and center. you probably have to remove the air breather to see it