The main problem you have is that the end where the mounting tab is must be mounted solid. No give. The length of the cable can give some flex or deflection too. But that is not you major problem. I have a cable as long as yours and it works fine. Get the end mounted correctly and see if it pulls your throttle open. The height of that mount in relation to where the cable hooks to the carb needs to be right as well. Move the throttle by hand out at the carb. See where it starts and stops and the arc that it moves through. Generally you need the cable mounting point to be a little below the point where it connects to the carb. That way it can fully open the carb.

tad bit lower than the connection on the carb correct.

Generally, yes. That is with the carb in the fully open position.

So when I make the mount I should have the carb fully open? Before I bolt it on?

Look at he arc that the throttle lever goes through when you move it. If you make the cable mount too high it may not pull the carburetor fully open.
That is only part of it. This very had to do on the keyboard. I think you need someone local to help you with this. But try this. Unhook cable from the carb. Have some one push the throttle to the floor and hold it. You go to the carb and open it wide open. Put your cable back on the carb while it is wide open. Now look at the cable housing and that will be very close to where it needs to mount.

It's not the best set up since I'm not the best at modifying stuff that's mot meant to be. .

If it is opening the whole way, it should run much better.

Everyone starts somewhere... and your willingness to even consider modifying something is a very good beginning. Keep an open mind and some determination to keep the end goal in sight as you work to find solutions.

Also a willingness to revise the first attempt as you discover and understand what is required, or something that initially was overlooked will improve the second attempt.. revise and edit, refine, and improve.. it is all part of learning, and some of the fun that can happen with old vehicles..

Another thought is that a visit to a salvage yard to see how the Ford carb throttle cable mounting bracket works on that particular carb can give your engineering mind's eye some possible solutions that can be adapted...