Haynes manuals are worthless. Spend the money and get the factory ford manuals.

Something like this:

http://www.tias.com/11384/PictPage/1922298514.html

or

http://www.autobooksbishko.com/item.cgi?id=119

Factory manuals are sometimes broken into 2 or 3 "volumes". One for chasis, one for drivetrain, etc... You can probably find these cheaper on ebay.

There is probably someone selling it for $5 on CD. I see on here where someone said the CD sucked. I myself like the CD because it is cheap. I have a lap top and can set it next to me while working on the car...

All that being said it is a 1978 Bronco, how complicated can this thing be?