I sold my motor setup to Shane for $750 without a clutch or ignition. I believe its a good deal and worth $900 but this economy sucks. You can bore those out to 85mm and make a 431 out of it with a 4mil crank.
I myself would buy it and throw the Polaris cylinder away and put on a Puma or Shinx on that bottom end
Stripped drain plug is an easy fix.