The issue is the travel at the throttle handle it self.
The cables from VANS have a 2 1/8” travel. That’s all you have to work with. The throttle, mixture, prop all travel 4” in the quadrant. In order for the levers to move those 4”, minus a 1/8” because I don’t want the handles to bottom out on the nice anodized plate, the hole will have to be drilled at 2.66” from the pivot point. Thanks to Dan K and Salamander for helping with the math!