I seem to recall some 67 K20s had D44 front diffs. Supposedly there are D44 camber adjustment shims available. As I recall, the manual for my 72 K10 w/ D44 mentioned this as well.
https://www.google.com/search?q=dana...ber&gws_rd=ssl
https://www.youtube.com/watch?v=tKsyifhXZwY