I don't think it is just the gasket that's bad. I had no leak in my 428 FE before installing the Canton
oil pan last winter. After going nuts chasing the leak, I bought a new (Fel Pro) gasket and dropped the pan. Just for $hits & giggles, I put a straight edge to the pan flange and lo and behold, the flange was way out of wack. The center rails were just about .125/.150 low and twisted downward at the outside. I hammered and twisted and tweaked until the flanges were almost perfect and square. After putting it all together with black silicone I tested it last night (put about thirty miles on it) and put it on the lift when I got home. No leaks...not a drop anywhere under the car. If you have a Canton and it leaks, It may not be just the gasket... check the flange.