What makes you think it's not as good? Cheap? We ALL know a true 4-link with
panhard bar is better than a triangulated 4-link....otherwise GM would not have gone with the 2 trailing arm,
panhard bar and torque tube on the 82 Camaro and Ford would not have dropped the trianulated 4-link in favor of the very same design on the 05 Mustang. Plus the square-tube offers much better numbers on vertical loading than round tubeing which is mostly used in applications where there is loading in all directions. But, hey, you have their Mustang-II on the front. And it is your car. BTW, how is that Ackerman on the II? Do you notice your inside front tire making noise before your outside front tire? A LOT sooner?
I do have a question about your choice of engines. Why did you go to all the trouble of putting a 429 in a 67 when you could have had MORE power than you could ever hook-up in a street car with a 428 CJ and ALL the work of how to fit it in the engine bay was already done for you by Ford? Just a question from a 58 year old who's been doing this stuff for 46 years.