My understanding is that the '92-'94 engines are a direct bolt-in. They started changing things in '95, so putting one of these motors in will require a lot of extra parts (I think mostly associated with the accessory drive). The '94 had the longest timing belt change interval of these engines. At the same time, though, the timing belts are so easy to change in these cars that it doesn't really bother me that my '92 has to be changed every 30K. I've got it down so that I can do a timing belt change, start to finish, in under 30 minutes.
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Lance '92 965 w/ 180K miles