What if....

[rtj]

I've got a dual cylinder Wilwood pedal assembly sitting in the garage. Has anyone seen these installed in a c3?

It's a nice unit with a balance bar for proportioning.

 

[BBShark]

Something else to consider. The pedal lever ratio for power and manual are different
Manual 1" master dia. 5.5:1 pedal ratio
Power 1.125" master dia 3.5:1 pedal ratio

Thanks. Is the factory pedal drilled for both?

Yes. The pedals are drilled for both. The pushrod is in one hole and the brake light switch braket in the other.