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

That's an interesting mix of brake components.
Was the car made sale in US, or Mexico?

Yes. The Master Cylinder is for a disk/drum system.
Depending on the casting number, it might even be somewhat rare!
In addition to the larger reseviour for the front pistons, a disk brake master cylinder will not have a residual valve in the rear outlet (for the front brakes).
Around 1975-76 Chrysler started using 'expanders' in the drum brake wheel cylinders instead of residual valves in the outlets.

Rear brakes you show are using an automatic adjuster system the Chrysler stopped using in 1969. To purchase parts, and to adjust the shoes, reference 1968 and earlier.

If you want to see what the master cylinder was originally used for, check the tables out in the article linked.
Brad goes by "Mastershake" on Mopart. He's made some updates and corrections since it originally came out but still a good starting point.
http://www.moparts.org/Tech/MoparAction/Master_Cylinder.pdf

A picture of residual valve is shown on this page.
1970 Chrysler Imperial Hydraulic Brake Service Guide from the Master Technicians Service Conference Session 274