A few more factoids...
Ford used the threaded oil filter block adapter on a bazillion V8 engines, so if you are a junkyard scrounger you can get one there.
You can put the ACT between throttle body and MAF if you want; in theory the calibration will be off since the A9xx series of computers are expecting air that's already been heated a bit, but it doesn't seem to matter in practice.
Headers: Those of you running an automatic transmission or a manual tranny with a hydraulic clutch have another option. The headers Ford Racing sells for using P heads in a Mustang will fit. (Part no. M-9430-P50,
http://www.oemfordparts.com/scripts/prodView.asp?idproduct=1156). It's a tight squeeze above the passenger frame rail but a good exhaust guy can deal with it. They won't work with a mechanical clutch linkage- they interfere. I modified a set of WH shorty headers to work. No. 7 tube was the only one that had to change. Lot of work though. But I wanted headers and I have the stock clutch linkage.
The later Explorer engines used a returnless fuel system. As far as I know no one has made that work on an early Bronco. A simpler option is to find a fuel rail off a Mustang, Crown Vic, etc. Any 5.0 engine with passenger side throttle body. I got one for a Mustang 5.0 on Ebay for around 10 bucks, but that was a long time ago.
If you want to add a little bling, look for a set of Mustang 5.0 valve covers. Direct swap, a little more stylish than the stamped steel Explorer parts. Again, I got a set on Ebay, probably for less than what the shipping would cost now.
Speaking of which, this isn't specific to the Explorer swap, but EFI engines require sealed valve covers. If you use a valve cover with an atmospheric vent (for example stock EB covers) you have just introduced a massive air leak as far as the computer is concerned. Keep the stock 5.0 PCV setup, andwith the vent hose running from the oil filler neck to the throttle body or alternatively to a spot on the tube between MAF and t/b.
Nice job on documenting everything, Tito! I wish I'd had something like this when I did mine back at the dawn of time.