Engine and transmission can work usually not the best choices. T case is to big so a adapter will be needed to make the transmission work in a EB.
The EFI setup on the 89 is really to tall to clear the hood in a EB although people have done it with big body lifts and aftermarket hoods. Or just convert to the car style EFI or a carb.
If the engine is a 351 then it can be worth getting if it is a 5.0 then it better be dirt cheap