Please help, I need a good chocolate cake recipe for a 12x18x2 in. pan. Plus the cooking times. scatch or box. Thanks.

You could use my *original* WASC recipe.
http://cakecentral.com/recipe/the-original-wasc-cake-recipe
See, a 12x18x2 pan uses between 2 1/2 and 3 mixes to fill it so double the recipe. If it seem too full make a small round OR some cupcakes w/the extra batter.

I use Kakeladi's WASC recipe ALL the time - it's great!