with the flat bar makeing the hole stationary,IMO is not good,more chance of it hanging the throttle open,thats why it made to move independant of the throttle stud and purpose of the slot in the bar..

what i would do is build a rod with a offset in it,use a short piece of the flat bar welded to the rod end to hook to the bell crank.

then a adjustable end for the carb stud.

this will make the adjustment at the bellcrank void and you can leave it where it is not hitting and has more travel.

sorta like what MY340 did with his 3 piece set up,he just welded in the turnbuckle and made it the adjuster end.

your close.real close,i just dont like the flat bar set up and the way it locks to the throttle stud.

of corse I have had a few throttle stick Wide Open before(remeber to turn the key off when it does this)