re: OB grease monkeys: rebuilding 92 Bronco engine

What state are you in? Neither of my trucks have emissions equipment. You can get simple O2 sensor deletes since your truck is EEC-IV, not even need a tune. If you built your engine with Gen 1 Lighning parts you see about 250hp/350tq conservatively. Opt in an aftermarket cam, headers, and a tune and you'll be closer to 270/380. Also, 1997+ 5.0 Explorers/Moutaineers had iron GT40P heads which are a very cheap source for practically the same GT40 iron heads of the Gen 1 Lightnings (GT40P's have a slightly smaller CC and different ports for smog crap). GT40X aluminum versions are less than $700 a pair new too. You can easily get 300hp out of that engine with inexpensive OEM parts and no compromise for driveability or mpg's.