Sudden loss of pedal

Well it is all kinda irrelevant now. Some parts I've been waiting to sell just did so I'm just gonna use that money to re-line the whole car, replace the master and the wheel cylinders. So my new question at hand is does anyone by chance new a 73 Darts MC bore diameter?

...however... I am now partially tempted to fix the problem first anyways to discern exactly what the problem was just for closure on this question.