Yes, I’d like to keep the 5x4 rather than drop more cash on new wheels and tires too. This is the one I was thinking of getting. Comes with lower ball joints.
That is the same kit that I used in my 64 GT and I did not use a proportioning valve. It worked great, with zero issues without valve. And my 14" Cragars fit fine, with the 5x4 rotors.