if the pedal travels too far, the rod needs to be longer. a rod that is too long would possibly cause the brakes to drag, but it will not increase pedal travel.
the new rod length will be dependent upon which master cylinder PI Motorsports sold you; i.e. is it an OEM style replacement master, a GM master, a Ford master, etc.
I would expect Jerry at PI Motorsports to have an answer for you.
I would draw a picture to detail how to deduce the rod length, except I'm on the road working from a laptop.
-G
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