367 vs 410 Engines Masters

The simulation I ran resulted in 3.71 gears for the 410 and 4.11 gears for the 367, and they were close. So I think you are right in this case

But after running the simulation where I moved the HP curve up 1000 RPM's and wasn't able to get close to the performance of the lower RPM 367, I think gears aren't enough and your theory doesn't bear out.
Gears aren't gonna give more than the engines power will supply, why you can just throw 5.13 behind any old engine like a stock /6 and go 12's :) it will accelerate quicker until it runs out of hp which won't be too far.
BTW, the 8HP simulation and 2.65M iterations was a bust, couldn't get close to the performance of the 727 setup. I wouldn't be surprised if my slip percentages and such make it an invalid test though, the simulator just isn't sophisticated enough to make it work. Plus the gear ratio's don't make it a slam dunk either, with a 4.71 first gear and a 4.11 rear gear, the result was the trans was in 1st for 0.000 seconds, or such a short time it can't be displayed in the output. More gear splits have to be an advantage, but I couldn't show it with the tools I have.
I think 367 would love a 4 gear, cause it has a fairly flat hp peak.