The JDM KL-ZE 6 cyl engine is a relatively easy swap for your KL-03 6 cyl engine. However there is some vacuum line complications which may prove difficult for a novice mechanic. If you are looking for a lot of information about the MX6 I suggest going to
http://www.mx6.com. There is tons of information about KL-ZE swaps and the pains people go through to do them.