Good aftermarket K frame
Hemi Denny is a member here; he makes K-frames and suspension parts. Below is a link to a bunch of members that have used his parts.
http://www.forabodiesonly.com/mopar/showthread.php?t=224738&highlight=HDK
You can also search this site for related links to HDK.
Some other members here have used alterkation and have had good results.
Good luck with your build.