10"drums front and 9"drums rear, what master Cylinder use?

Hi guys, finally i bought my first car last december, a Plymouth duster 1974. The car have 10" drums on front and 9" drums rear but the master cylinder looks like an disk/drum configuration.
The braking performance feels fine to me but the drums of all wheels need to be replaced, they pass the maximum diameter permised.

Can i stay with this master cylinder or i need to replace it with the correct one?, i think is the Raybestos number part MC36338

It´s ok that my front drum size was 10" size? Attach photos below (proportional valve to)

i don´t wanna die.

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