My recommendation is to always go through H-motors online. I bought a rebuild from Attarco for my wife's DX. Basically it was long block only and was a JDM bottom end with a D15B2. The engine was relatively good but the car could not pass CA smog. The engine is still in the car but, I have had to do some work on it to fix some issues from the rebuild.
On the other hand, I have a D15z7 (JDM D15b dual VTEC) in my HF and I have had no issues with it. I recently tore the thing apart to do some upgrades on it and the thing still looks brand new inside. This was definitely a low mileage engine for sure. This engine came from H-Motors. I have also bought and installed other H-Motors engines for other people. If you must have JDM and you live on the West Coast, save yourself the issue, Buy-Hmotors.
On the other hand, I have a D15z7 (JDM D15b dual VTEC) in my HF and I have had no issues with it. I recently tore the thing apart to do some upgrades on it and the thing still looks brand new inside. This was definitely a low mileage engine for sure. This engine came from H-Motors. I have also bought and installed other H-Motors engines for other people. If you must have JDM and you live on the West Coast, save yourself the issue, Buy-Hmotors.