87rotary

Im most likely buying a really nice modified 87 rotary rx7, the car starts and runs, but owner claims it has a big loss of power, could it be no compression? im going to try and get a compression test done on it saturday, but if the outcome is bad, then i might be looking for a way to fix it possible? prolly not, or just to replace it with anything that runs! Im in Wa state farther north near canada. If your willing to drive up here and drop it off, even if i paid you to install it cuz i have no knowledge of that!