What Master Cylinder? and more

Hi All! I'll try to make this short n to the point. Car is (going to be) a 73' Duster 60/40 drag/street car in progress. I upgraded to 11" X 2.5" LBP Rear brakes and I plan the front brakes will be STOCK 74' Disc A-body.

1) Can someone tell me the proper master cylinder Part # for this application? A chain store # will help , I'll research it.

2) My plan is to just to "T" off the front brake lines to the front calipers and run 1 line to the rear with an adjustable (proportioning???) valve? Am I on the right track?

3) Can some one fill me in on the "fix" for the emergency brakes when you swap to the 11" rear brakes? I understand there's some sorta legnth problem on the cable or backing plate to lever distance. I'd like to keep the e-brake for what it is an e-brake. Looking for the answers before I get there...

Thanks for any answers..
Eric