Pedal Help -

OK folks, need some insight. Installed 340 pedals on my 70 Duster. When I push in the clutch and the brake, the brake binds and has difficulty returning without foot assistance. Once I let off the clutch, the pedal returns fine. Both pedals work fine independently. What I noticed is the clutch looks like it is walking out. I do not have a spring on the clutch side, it was removed. I felt up around the opposite side and noticed there is no C clip on the bar holding the brake and clutch pedal, so I would assume this is why it is walking off.

Questions: Ideas on why this would bind?

and

Where can I get a C clip or what size would I need?