3/4 ton master cyl. in 1/2 ton truck?

[Southpa]

Its nice to be home again, staying this time. I want to ask about swapping my master cylinder which is leaking out the cap so much that I have to hang a can under it to catch the "drippings".
Its a 1970 1/2 ton but I've swapped front ends with a 71 so now I have front disc brakes. I installed a 3/4 ton booster and have a 1/2 ton master (leaker) with the single hold-down clip. What I want to do is replace it with a 3/4 ton master (the kind with 2 hold down clips). Any problems with that? Are the line fittings to the prop. valve the same size? Would this produce too much pressure to my front calipers and/or rear wheel cylinders? or are all calipers/wheel cylinders basically the same between 3/4 and 1/2 tons? Any suggestions? much appreciated!