the vacuum hoses have to be re-routed for the explorer intake and you have to tap the lower intake manifold i think for a coolant sensor....haven't done it personally but that's what i hear.
The 5.0L explorers came with the GT40p heads, which are "quick-burn" heads, and are quite a bit better than the stock heads. There are special headers for them though, because as stated the spark plug location is revised for a better burn.
The explorers also came with a 65mm throttle body, but i don't know if that will fit on a mustang, although it looks like it will, i just don't know what spacer you'd need.
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2005 Suzuki Hayabusa GSX1300-R
1980 Ford Thunderbird - 255 V8
ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain
hi-po Mack Truck hood emblem
1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc.
Sold 02/06/04 
1989 Mustang GT ET: 13.304@102.29 mph (5-24-03)
Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)
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