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I was told that the hoses are different and that R134 will seep a little bit. This is only minor but may mean that you could have to recharge it from time to time. Other things to consider:
1) The evaporator on an R12 system has a smaller exit orifice which makes it hard to get the proper pressures. You can get it to work (quite well) but you may have to over charge it a bit. If you want to fix this properly you would need to source a later year evaporator and the matching expansion valve.
2) It is always a good idea to upgrade the condenser with a parallel flow design. The R12 systems (and older R134) used a serial flow condenser and it simply doesn't do as good a job at cooling the gas. Parallel flow fixes this and will give you cooler AC.
I converted a '90 XJ a couple of years ago and it is working great but I have to run higher pressures to get cold air because I didn't change out the evaporator. If I "dial it in" at the pressures recommended on the traditional chart, it will get cool but not cold. This is particularly true on 100+ days (common in South Texas).
The system is designed for R12, R12 will give the best cooling. Id stick with R12. Non R12 coolant will make things work harder to get same level of cooling. R12 is still readily available.