I wasnt planning to cut anything........I may only drive the car a few miles every two weeks in the SUMMER months, so filling it w/15 gallons of AV gas or similar and then treating it would pay for a new tank that would FIT the hole and be easy to empty. I have seen most east coast tanks and they all seem to get corrosion on the tops in addition to water/rust on the bottoms- thats translates to crud into the carb/engine.