Also by moving inboard you increase the amount of movement at the tire for the same amount of spring flex.
A buddy of mine helped his buddy (SMP, ex-CK5er) do it on a 72 K5 and if flexed like MAD and was pretty stable from all reports I have heard. Someone on here actually still has the K5 in NorCal I believe. I am not 100% sure who though. It is black with a yellow cage.
EDIT: It is Zcarczar that posted above in this thread.
Harley