I have installed a couple of these...Honda, not Toyota, but same/same as far as quality. And Ranger is correct, it is because of strict inspections/Raging Rust in Japan that these things are low milege. Japanese only drive 5 to 8k a year, and cars rust out quickly there.
Remember that you will need to use your old intake/exhaust, fuel injection and distributor. The Japanese ones are not the same, and you would never be able to get parts, and not smogable with the japanese stuff.
Some model engines are slightly different, usually lower compression, because they have lower quality gas. This is not a big issue, the engines run very well. I never had any issues with oil consumption, etc.
Rising Sun engines in Santa Rosa Ca. is a source, they have a web site and they ship. I am on the wrong computer to give you the link, but shoot me a PM if you have trouble finding them. Good Luck! <IMG SRC="smilies/biggrin.gif" border="0"> <IMG SRC="smilies/biggrin.gif" border="0"> <IMG SRC="smilies/biggrin.gif" border="0"> <IMG SRC="smilies/biggrin.gif" border="0">