Converting to front disks

ideally you would also run a disk/drum master cylinder and put in a brake bias

the pressures necessary to activate fully, a set of disc calipers is way higher than that needed for the rear wheel cylinders... so a bias to stop the rears being full on when the fronts are only 50% on is needed. otherwise the rears lock first resulting in a disconcerting loss of control. i.e the rear will try to overtake the front in a spin until you lift off the brakes

if the fronts lock first at least you just, go...... in a straight line.

single most best upgrade i did was to add in the brake bias
My dubious 1 pot calipers really work quite well when allowed to supply most of the braking.

previously the rears were like an on off switch locked or not locked in anything but bone dry conditions
and my rears are 9 inch..!

on an empty or private paved road
Bias rears nearly off and start doing hard stops i.e try hard to detach a retina
each time adding a bit more rear brake until you achieve the best stop
you will know if you go too far because the car will end up sideways

when happy lock off the bias adjuster and never worry again.

Dave