1968 - 197? small block throttle cable bracket (in Ontario)

Is there really a difference between 2 barrel vs 4? This is what I have now:

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That shaft with the U-shaped arm was welded on. This might have been done a long time ago when a polysphere 318 was swapped for an LA 318 and the bracket was re-worked. The U-arm is for the transmission kick-down rod. This bracket has worked for a long time (the carb is a 2-barrel carter) but the end of the shaft is too close to the valve cover so I'd like to get the correct bracket.