I pulled out the accelerator pedal and drilled and tapped the upper arm for the 1/4-28 stud on the rod end bearing. Since there is a pedal box support that’s partly in the way, I installed the rod end bearing on the left side of the upper arm.
Unfortunately, that didn’t move the linkage far enough to the left to clear the pedal box support completely, so I also decided to slide the pivot shaft to the left a bit to increase the clearance. The pivot shaft now just sits flush with the right edge of the inner rod end bearing on the firewall.
To prevent the shaft from moving either direction, I installed the other shaft collar on the other side of the outer rod end bearing on the firewall.
This moved the pivot shaft and outer linkage an additional 3/8″ to the left. It’s pretty close to the steering shaft now, but still has plenty of clearance.
The linkage from the accelerator pedal upper arm to the pivot shaft arm now clears the pedal box support. It’s still pretty tight, so I may relieve the support slightly to prevent any touching, but at least I don’t need to remove a lot of material now to provide this clearance.