Classic Industries OER front conversion question

Firedart said

I should have stated in my original post that I have a 70 swinger. The car had original SBP drums front and rear. The other rearend I’m putting in has BBP as well. Do I need to upgrade the master cylinder or will the old one work with the bigger brakes and just change out the prop valve?

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It depends on what master cylinder is in there. If it was for 4 wheel drums at the very least you'll have to remove the residual pressure valve from the disk brake side. If the chambers of the master cylinder are the same size I would probably just change it out though. The disk/drum masters have a larger reservoir for the disk front brakes.