Proportioning valve or no for 65 Dart disc/drum brake conversion.

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.

DBK6272A-40-B - 1962-1972 Mopar A Body Small Bolt Pattern Standard Disc Brake Conversion Kit w/ Powder Coated Black Calipers
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.