Need more carb linkage travel

[Cobra 29]

Bob, I have the standard gas pedal to carb linkage (I believe) in the 427 SC. I recently discovered that I was not achieving WOT in the primaries when the gas pedal was fully depressed. Only about 45 degress in the primaries which means the secondaries were not even opening. The carb is a Holley 650 DP (4777).

When I disconnected the gas pedal linkage at the carb and operated the carb lever completely the primaries open fully and the secondaries open at 45 degress of primary and are fully open when the carb lever is fully back. I believe this is normal operation for the carb.

I need more gas pedal linkage travel at the carb. Presently I get approximately 1.75" of travel but need about 2.5" of travel. I have both linkage arms adjusted as short as possible. The linkage arm from the carb to the cross shaft is 7.5" and the second arm (from cross shaft to pedal lever) is 5.75".

What can I do to increase the linkage travel at the carb? I believe I can drill a hole closer to the trottle shaft in the carb lever to provide more shaft rotation with the same linkage travel. Any other ideas? Thanks in advance.