One key factor is, how high off the floor is comfortable for you, while driving with your foot on the gas pedal.
Depending on what induction system you have, some end up with the pedal too far off the floor and it’s very uncomfortable for the leg
The flipside of that coin is that it’s too close to the floor and you can’t get full throttle.
Brake pedal height is unfortunately subject to change in the modern era, based on the replacement parts and length of the pedal rod to the master cylinder.
Or pedal rod to the cantilever if you have vacuum assisted brakes.
Is your gas pedal fully adjusted and corrected (including any floor coverings) and where you want it?