umm.. Wow that's a good price, ur gonna need another computer for it to work, and I'm not sure about the engine mounts. The 3.5L's have 3, 2 engine and 1 tranny. If u have 3 as well, then it shouldn't be too hard to do a swap.
well, the computers are different (OBDI vs OBDII), and the exhaust is different (2.25 vs 2.5). that would be enough to deter me....maybe other folks can think of more reasons that it would be impractical to make such a switch.