Advice on manual style brake master cylinder on 70 Dart

"Simply slide out?" No, per posts above. I would use Johnny's method next time. When I did it, I put the MC over vise jaws w/ rod hanging loosely down, slipped a socket extension rod thru the hole and beat on the extension w/ a hammer. It comes out as the old rubber bushing tears up. Do not "test fit" the rod w/ bushing. Once it goes in, it won't come out w/o destroying the bushing (how would I know?).

Most new manual MC's come a rod installed (see rockauto). I am surprised yours didn't. BTW, in my 64 Valiant, I used a newer aluminum MC for a 95-99 Breeze/Cirrus/Status (w/ ABS). The rod hole wound up at the same place as for my 64 (single pot) MC, after putting the new MC on a 2-4 adapter plate, thus my brake pedal sits the same place. The rod locked tight in the piston using the rubber bushing. Indeed a "test fit" caused me to waste the first bushing. I was even able to use the rubber dust boot on the new MC.