I worked for a resin plant in the early nineties on the night shift. We had plenty of solvents to experiment with. When it was time to upgrade from a 318 to a 340 I thought I would try some fuel experiments on the old motor. The goal was power. I tried acetone which seemed to work best at starting a flooded motor by pouring it in the carb, not much of a power increase when two quarts was added to a ¾ tank. Toluene had the best power increase but was barely noticeable in the overall scope of things. I was bouncing ideas off our stationary engineer. He said that the rate of burn would be faster from the additive, but not produce more power because nothing additional was being added to the combustion chamber. The car ran noticeable warmer though.
The is nothing here that hasn’t been tried before.
How about a toluene, gas, nitrous mix?