Arent we talking abouut disc/drum brakes ?
Lets face it, we are talking about 40+ year old cars here. None of them are going to stop like todays cars
The only difference in the different bore sizes is going to be the amount of pressure its going to take
to push the brake pedal.
If you want to get all wrapped up in it, they do have different bore sizes in that particular MC .
Choose your size, and bolt it on.
I choose not to get all wrapped into it.
You can grab an aluminum MC (which came in about 50 different Mopars) and bolt it in.
My money says the difference in pedal feel would be very minimal, if any.
.02
