318 engine overheating

All of Brazil is Ethanol right? Hows your jetting? Very easy to block that passage off, just get an intake gasket that has it blocked or go old school and put a piece of aluminum can there to block it and see if that helps. Not sure how long that will last but it will get you a benchmark to see if that is the issue. Usually a warm intake is a good thing. I think you may be running lean...