K frame install alignment?

Download yourself a factory service manual

http://www.forabodiesonly.com/mopar/showthread.php?p=1970088617

Don't know if there is one for the Duster/ Demon stuff but there IS one for Dart. You want the 71 body manual. This is from page 236 in your viewer. This manual is not numbered properly, the original page no is 13-2