depends on what your plans are for it..... you could swap in a 22RE and put in a W56... or you could swap in a 3.0 again and go with an R series tranny....
most will tell you that the 3.0's aren't very good engines... i'd agree..
problem is the 2nd gen is pretty heavy and that 22RE would probably be fighting to keep up.. whats your budget? you could also go for the popular 3RZ swap.
plenty of power and aftermarket support.