I have a 68 Mustang with a 289, and my brother recently crashed, and is now scrapping a early 90's Bronco with a efi 5.0L. Does anyone know how hard, or even possible, it would be to swap that in to the mustang?

 

Well the engine should fit with minimum hassles,, just gotta transfer all the electronics (computer etc) & that could be a pain.
Also I think the intake plenum on those Broncos is pretty tall(?) will it fit under your hood?

 

You could just take the EFI system (intake, injectors, computer, sensors, etc.). Before you get too excited, though, make sure it's a mass-flow system. Speed density will be more of a headache than it's worth.

 

How much work would that be? Would the computer see that something was up if it was riding on a different block with different specs? That would be a feasible option, plus no motor swapping, which is a plus. thanks

 

I'm not sure, but would wonder if the cam timing from the 289 engine is gonna work with the 302 FI(?)

And, you might also need to 302's distributor.. doesn't it belong with the EFI setup as well?