Geoff,
Do a search for "master cylinder" in this forum. A couple of "inexpensive" two-stage units mentioned are the 1980ish Ford Fairmont unit and the 68-74 AMC unit. Apparently, the Fairmont unit is for a front disc-rear drum setup and the AMC unit is 4-drum setup. Both units have the line outlets toward the motor.
Both units probably need pushrod lengthening. You may need a proportioning valve to "balance" front-to-rear braking. A manual valve in the rear line circuit may suffice. It appears that the dual-stage unit reservoirs are sized for front circuit and rear circuit respectively.
Assuming you are working on a "stock" car with original drums, and it is not driven excessively hard and with limited mileage, I would suggest that you keep the single stage unit, having it rebuilt with bronze bore liner by White Post Restoration or some other shop.
Good luck!
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