It should. Is the '74 origanally a straight 6 or a V8? If it is a V8, no problem. If it is a sraight 6, you will have to do the usual straight 6 to V8 conversion parts.
As for the engine itself, it is a normal small block V8. The Cougar oil pan is wrong for a Bronco as already mentioned. There is also a dipstick in the timing cover that will be wrong for the Bronco pan. No show stopper, but you could end up with 2 dipsticks. Or you can plug the one in the timing cover and just use the bronco pan dipstick. Keep the harmonic balancer with the timing cover, I believe there is a change in the timing marks.