They suggest you use your intake w/ injectors, stuff like that.
You can do simple tuneup, preventative maintenance, but pretty serviceable as is. I have had the local JDM distributor do a swap, and I have done my own. The engines are pulled with the accessories - typically alternator, p/s pump, a/c compressor, etc. again probably serviceable as is. They pull them in Japan at 55-65k miles or so, I believe. They will typically state the mileage. They typically appear well serviced or maintained. I just did the timing belt on my JDM engine as routine maintenance four years after initial replacement. Everything looks good. Been happy.