The current setup on my car is the Willwood front calipers with the 6:1 pedal
and a 13/16" Datsun dual master cyl
and no booster. It's the best set up I have tried. I found the 3/4" master had
good feel but too much travel especially
with the 6:1 pedal. I ran the 3/4" with the pedal and the stock front calipers
for a while but wasn't happy with it.
Brent