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I feel a little silly now. All those trees getting in the way of my view of the forest.

The ideal configuration of your throttle lever on the carb would be angled 45 degrees towards the front of the engine. WOT would then be about 45 degrees to the rear. That gives an even pull...

What you're missing is how levers work.

Pulling a longer lever the same distance as a shorter lever results in less angular rotation.

In this example, the point where the lines come together at...

Since that carb is a Rochester Quadrajet, it's almost surely 750 CFM. There were some 800 CFM, but those are in the minority. An extra 50 CFM wouldn't matter much any way.