What size master cylinder bore for a 55 buick

I am going to convert my 55 Buick 2dr HT from a single master cylinder to a dual. What size bore would you recomend. I have seen info on 1" and 1 1/8" bore and I am planning on manual brakes with the Scarebird disc brake kit up front and drums in the rear. What has the best pedal feel and response. I plan on driving as much as I can once the car is done. Thanks!

 

scarebird will advise you on the best master cylinder when you buy the kit from him.