Depends on the online source, I bought mine from JDM Source out of canada... they were awesome.. send pictures of actual motor, compression tested (which matched my test when I got it), opened valve cover and looked clean (little build up, but with 40K it should have a little)... harness was good, ecu, ignitor chip, etc.. everything I needed. I swapped oil pans (got the GReddy) and looked at bottom end, swapped out oil pickup (old one looked real clean)... again.. depends on the source.. if the source has been around for a few years, you can bet that they're decent to deal with (most forums would tell if they weren't... esp this one)... I also got a B-series for a Honda also.. top notch as well... If you call them, feel them out... they are 240 fans as well... As for buying an engine that A) was raced and B) in a wreck ... I would want to see it run first...
http://www.jdmsource.ca/
Good luck with your search...