Although I don't support dealers, since I'll be competing with them sometime in the future, but they are supposed to have a factory trained Master Mechanic install the block, not an amateur. Otherwise there is a possibility the manufacturer will support and give you a new car. I haven't hear too many cases where they've given a customer a new car while on the powertrain warranty, but if this happens, you can demand for a factory trained master mechanic to work on your car.
Steve:
I think you should sell your LX470 and get the RX330. You're probably not going to take it off-road, so why have a big, ugly, beast?-