Does anyone know if there is anyone who sells a throttle cable bracket for a high rise intake on a B motor that gives you the ability to adjust the position of the clamp that secures the throttle cable? Preferably, a bracket that looks similar to a MP or Mancini bracket that somewhat resembles a factory bracket rather than the Lokar type brackets.

I used this one from Jegs, Worked good for a taller intake. https://www.jegs.com/i/JEGS/555/15154/10002/-1

The tall brackets I sell allow you to rotate the top part to get the correct angle. The throttle cable also has some adjustment on where you clamp it.
https://arengineering.com/home-page/throttle-bracket-kits

Amazon less than 30 bucks..

I've used Andy's brackets on a couple engines, and they work fine.
On the most recent deal (340 w/AirGap, no kickdown) we just measured for a while and fabbed a 1-piece.
Ran concentric return springs from bottom of carb throttle arm back to the bracket, gets them out of the way & I think it's tidier.