We made a water heated intake manifold plenum where the fuel exited side draft carbys and impacted upon the water plate, The corrosion on the plate was high so the methanol was being vaporized effectively. The plenum volume was 8 times one cylinder, the carburetors were internally modified to decrease droplet size using my Smartcarby technology.
The purpose of the modifications we did was to decrease droplet size considerably thus decreasing vaporization time, that allowed high RPM. The limitation of the engines was vaporization not breathing.