v8 -accelerator pedal not returning

Just fitted a V8 to my series 3 i bought it with a siezed engine that the previous owner had partially stripped and abandoned.At last i have got the engine running,however the accelerator pedal does not return. Im missing a spring somewhere.I have a spring up at the carbs.Is the spring too week or am i short another spring on the bulkhead mechanism?
Another question while underneath i noticed the shackles on the front leaf springs are different lengths,and the ones on the rear are different lengths left compared to right is this correct?as the landy still seems to be sitting straight.

result of my problem;the spring attaches to a bracket on the throttle bar ,this bracket was loose on the bar.sorted now.everybody on here is so helpful ??
shackles suggestion anyone...

Nice sarcasm

On my V8 conversion i binned throttle bar and ran cable striaght to pedal....

Got a piccy of shackles?