Gas Pedal Conversion?

Make sure the place where you have attached the cable to the carb is at the proper distance to the throttle shaft. This usually requires a Mopar specific adapter.
As to the bracket, I see I was treed;
But the 4bbl bracket moves the clamp higher and further forward, which in this case I don't think will work. The picture shows that your ferrule is already moved back as far as it will go; and the 4bble bracket would only make that worse,IMO.
I would compare the cable travel available, to the throttle anchor travel required and see how far yo need to go.
Bending the pedal lever may only get you a higher pedal.
It may be the ratio that is wrong, and perhaps you only need to move the attaching point on the carb.
On one of my projects, I cut some of that cable end tubing off , up at the front, because it was hitting on the clamp-anchor, before the pedal was on the floor. When I did this, I lost that steering bell on the end there. A better solution would have been to move the clamp/anchor back towards the firewall.

On another project I slipped a nut over the cable on the pedal-end before slipping it into it's anchor and locking it in with the plastic pin. I don't recall what I used to keep the nut on; probably a flat-washer; split and pliered into submission,lol.