Mike, call canton and ask them if you have the correct seal and the correct pan. Also, on those corners use a sealing agent called "the right stuff". It will work better than any silicone. You may also need more or better breathers to get rid of the crank case breather. I spent months getting mine to the point where the dipstrick tube would not be up when I opend the hood. Mine always has a small leak somewhere, I have given up on having a totaly leak free cobra.
synthetic leaks more too. Scott