To get the right pedal I suggest using the equation on Rally Design's PDF:
https://www.rallydesign.co.uk/pdf/de...pot_brakes.pdf
piston area.
To calculate piston area, use the formula 3.142 x r x r x number of pistons.
For example, an M16 caliper (2-pot with 54mm pistons) has a total piston
area 3.142x27x27x2=4581sq mm. For example, a 4-pot Princess caliper
(4-pot with 38mm pistons) has a total piston area 3.142x19x19x4=4537sq
mm. Note single pot slider calipers are calculated as 2-pot, so the Escort
RS Turbo Series 2 with 60mm pistons has a total piston area
3.142x30x30x2=5655sq mm.
It is usually preferable to select a total piston area slightly larger
than the stock caliper total piston area. This will give slightly more power
but with a slightly, but acceptable, longer foot pedal travel
This was the case with when I had the Wilwoods on mine. Going to the Cosworth calipers gave me a much better pedal.