750 Brawler vs 650 AVS 2 at the track, right OOTB !

273 said
What is over sizing exactly?, other than testing which works best for particular purposes, it's all guesstimation, carbs don't flow a certain amount of air they all basically flow whatever amount of air you draw through them, different carbs have different amounts of restriction kind of like headers. to be continued.

Smart people at the top of motorsports don't guess they test and test and test.

318willrun said
What I should have done, is run a vacuum gage inside the car and see what it did under WOT. That could have been interesting.

That's exactly what you should do. Vacuum aids vaporization and if an engine needs more vacuum to convert more of the fuel to a gas that's a burnable state then guess what happens?

Look at the 400 cube ford that ran best with a 650 and ask yourself why did it make most power with 5.5 inches of mercury @ the top end?