NEED ENGINE 94 SEVILLE SLS

I am in need of an engine for a 94 Seville SLS.  Prior to my buying the car I believe it was run hot.  I was told that you can't simple replace the head gasket due to the the threads in the block are damaged when the car overheats.   I was told I could use and engine from 94-95 provided that is come from a Seville SLS.   Does anyone have one available?  Please contact me at jimmypowe@bellsouth.net.