Using a disc brake master cylinder in a drume brake car.

So ! You are asking our opinion about an issue , correct ? A correct master cylinder from NAPA is $35.00 exchange . If you are that cheap you don't need our advise . My question to you is : what is your life worth ?
It is not an issue of $. I was merely asking if it should be done. I have actually seen it done on other '72 scamps with same brake setup. I will purchase the "correct" M/C. Thanks to all for their input.