Wilwood diskbreaki conversion

Do you really need those drop spindles? I bought a similar Wilwood kit that uses the stock drum spindles for around $600 from Hot Rods USA. They also throw in a proportioning valve, SS flex hose & fittings at that price. Very nice setup & easy to install. Only really time consuming part is fabricating the brake lines. I used a manual disc brake dual M/C from a '70 A-body & made a special bracket for the proportioning valve that mounted under the driver's seat (outside the car). The hubs have provisions for 4 & 4.5" bolt circle but believe there is not enough clearance for 14" wheels, it's fairly tight with 15".