Puking Gas !!!

My 65 Newport does that too, but at least the fill is in the rear, so it just spills onto the inside of the bumper. It is probably because unleaded filler necks are a bigger diameter, so the nozzle doesn't sense enough back-pressure as the gas reaches the top. When they changed to catalytic converters, they added a restrictor hole for unleaded nozzles that were smaller. That was so one couldn't fill up with cheaper leaded gas. Our cars were orphaned. One could fill up quick in those days with a big leaded nozzle.