How many KM/Miles does the car have on the clock? It's something to consider that a kit can cost you between $600-$1800 (US) or a new engine can cost you $5000. The thing about the IMS bearing is that it's a silent failure. There are no symptoms of it failing aside from metal particles in the oil. You may turn it on one day and have it go bang or it might never happen. Its a gamble.
My car is a 97 and has 131000 KM on the clock and its on the to list for me. Its worth it to me for the piece of mind and also if I sell it I can advertise that the IMS bearing has been fixed