milidon pan leaking on my 360

I had my motor all snugled in my 67 barracuda, when i got it fired up it had a leak at what apeared to be the rear lip of the pan. I have pulled it out and put it on the stand,im getting ready to put my new pan gasket on,any tips that someone might have??? I am using a fel pro 0.94 performance gasket thnxx Ted