The original gas engines made in the 30's and 40's were cruder than the bottom end of our glow engines. They will hold up fine if you have enough oil, I believe that to be 10% or 1:9 ratio or higher. Cost is cheap, Put in a gas glow plug and experiment with adding methanol. Don't bother with the carb if you don't want to. Adding methanol improves the power and mitigates the carb issue.