I thought it was a truck master cylinder the T/A set up used something other than a stock.
Yes but only if you go to a manual set up. I used that set up for more then 10 years and it worked fine.
When you go back to using the power brake booster with it, it no longer functions well.
What the big bore cylinder does is reduce the amount of pedal travel needed to actuate the calipers. That makes it more difficult to lock up the brakes.
The 65 and 66 Shelby's tend to be that way in that seemingly you can stand on the brakes without them locking up?
You could go PROBABLY as large as 1-1/8 but something happens to the formula with power brakes.
ABOUT a 1" bore is all that you need and most likely all that you will be able to handle as well.