Random stalling and dying

I just bought a 74 Duster in Oct. of 2016 and Wed. of last week I filled the tank and when I got home tank was leaking. I ordered a new tank and removed old one. At the bottom of the tank it was coated with rust and possibly other things I couldn't see. Although I didn't have any other issues with the Engine, I certainly could have used the new tank. It's possible a 46 year old tank has something in it causing your problem.
I pulled out the filler tube to empty it out and then take a flashlight and take a peek.