Master cylinder recommendations

I recently did a Scarebird front disk brake conversion on my '66 Barracuda. It was orginally 4 wheel drums, with a booster, and the stock master cylinder. I am going to replace the master and want to know if there is a recommendation for one that will be better suited for the disk/drum set up. Any input is appreciated.

As a side note, the booster was full of fluid, and the gasket is torn - any source for these?

Thanks!