I could not be happier with the Lateral Dynamics 3-Link.
I have been talking to Matt and Mark throughout the building of my '67 and have just started in installation of the 3-link. The quality of the pieces is excellent and the installation is not that difficult. If you are comfortable enough with your building skills to be asking about this type of project then you are probably more than capable of doing the installation. We were able to install the front and rear crossmembers easily in one day and if it were not for timing problems, I would say that we could have been done in two days without problem.
Did I mention that the parts themselves are awesome? The narrowed differential just arrived yesterday and pictures just do not do it justice. Once you get around the quality of the welding you just stare at the design.