With a stock K most of the "off the shelf" pans are not going to offer a whole lot of volume changes being most are made with the available headers in mind. Basically the only place you are going to have room is straight down.... We ran the Milodon low pro pan on our 340 block based W5 mill when we ran the stock front suspension and I believe we were only running 5qts in that and never had any oiling issues.