You guys have a stockpile of these rare 1970 only K members? From what I understand, the 1970 model is unique, the 71-71 fits but the steering box mounts are angled slightly.
I purchased a 1970 Hemi K-frame from Mega Parts. They take a small or big block frame and cut the mount perches off and weld HEMI perches on. They use a jig so the dimensions are spot on. They are usually made to order so don't let the out of stock keep you from calling in. Sometimes they will require a core to be sent in.
http://www.megapartsusa.com/proddetail.asp?prod=MP-HKF103
