Chris, I was in a rush to drop the new Killer B pan off with my builder the other day and I didn't get a chance to measure the "brim-filled" volume of your pan. If you have one around there, could I ask you to do that? Having the Cosworth baffle, I want to know what the "DEFINITELY not to exceed in the pan" level is, then put a scribe mark on the dipstick like you suggest. Then I'll live somewhere between the Subaru Full and Cosworth Full points. I'm guessing that another quart would go in to that point.
(Add a big oil cooler and a 2 quart Accusump, and I intend to pilot the Exxon Valdez. Lost one short block to lack of oil at the track, I'm not doing that again.)
P.S.: Saying it again... great fitment to the Full-Race twin scroll headers, eh!