Drum to Disk brake conv. no idea on the MC?

i apologies in advance on the post. i've spent the last couple of hours coming through the post looking for the answer and i'm just not sure. I'm in the middle of typical from drum to disk brake conversion on a 1965 valiant conv. 273 commando. I am using a 73 dart for the reference. everything is new. I have no idea what this master cylinder is off from the previous owner. All i am looking to do is setup a new MC for the disk brakes setup. I don't think i can go with power booster because of clearance issues. non power disk brakes will be fine i think. So without guessing if this will work i'm going to get a new MC, What do i need? Just a MC from a 73 dart? little confused here.. thanks

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