If you have steel gas lines they will have to be replaced also. Methanol dissolved the lining on my tractor fuel tank. Carburetors are susceptible to corrosion and a custom made carb will be required after a while. The vitron tip of the needle valve will dissolve causing problems. You will not be able to use much of a concentration of methanol in the fuel because evaporation of methanol will be deadly!
As I mentioned on another thread a few days ago we used a mix of methanol, nitromethane and castor oil for model engines. Never had any problems with the mixture. The methanol came in a glass bottle but we kept the mix in anything handy, mostly metal containers. Never had any problems but that was over sixty years ago.