Re: Spark plugs.
I'm running E3's on my 2000 OHV. I previously used Autolite double plats and both plugs perform very well.
Regarding removing the plugs from the pax side, try attacking them from the side working through the wheel well (with the wheel removed). You'll also need a long extension and a universal between the socket and the extension. If that doesn't work, try accessing them from under the engine. I remember having to do this with one plug on my 2.9L years ago.
2000 XLT 4WD 4.0L OHV, 5 spd, Alabama Cylinder heads, Delta Cams Valve Train and Pushrods, JBA Headers, KKM Cone Air Cleaner, BBK Throttle body, Dynomax Cat-Back exhaust, Summit Racing drilled front rotors w/ EBC pads, Cobra rear disk brake conversion w/ Hawk pads, 8.8" 4.10 Traction-Lok