The big probem with leaking pans is that the bolts are too tight and/or not torqued correctly. If you want to take anothe stab the the origional pan, remove it and super clean the mating surfaces. Look closely at the holes in the flange, and you will probally notice that they are distorted.
Tap the distorted area so that it it's flush or even a little concave on the mating surface. Use a cork gasket without sealer, and start all bolts finger tight. (If you have trouble keeping the gasket in place, a couple dabs of spray adhesive or grease on the gasket will hold it in place.) Do not start tightening on the corners of the pan because those are the last ones you want to tighten. Start tightening in the middle of the straigh areas of the flange and stagger each side of the pan. TIGHT IS A HAIR MORE THAN FINGER TIGHT. Get them just snug, run it to get it hot, then snug them again.
