Power Disc conversion/ proportioning valve question

I ran across this video from McCalla's Modified Rides showing install of a '73+ proportioning valve on an early A-Body. Seems reasonable. On my car ('68 Formula S FB), I ran '78 11.81" rotors and a Mancini adjustable proportioning valve in place of the factory value (original KH Disk Brake car) and got it adjusted so the fronts lock just before the rears. Beast brakes I have ever had on a car.