I've never seen a throttle spring break on a Tri-Power. Too much spring tension makes these setups virtually impossible to drive without the herky-jerky throttle problem. Rochester 2G carbs all have a spring under the accelerator pump that pushes the throttle plates closed--not as much pressure as the return spring, but it's significant.
The only reason I can think of to run dual springs is to satisfy a tech inspector.
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'64 GTO Tripower Hardtop (Wife's Car)
'64 GTO Tripower Post Coupe (My Car)
'99 Bonneville SE Sedan
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