Well I got the pan off, cleaned it up some and took some measurements. Stock pan on left, it doesn't seem like much of a difference but it's enough that the rubber seal sticks up out of the milodon pan nearly 1/2". The opening for the front rubber seal is off a similar amount.

I bought the milodon pan because with a windage tray I was sometimes losing oil pressure when braking hard or sharp turns. The 8qt pan fixed that but I don't want annoying oil leaks either. I'm wondering now should I put the stock pan back on with a standard vol oil pump and ditch the windage tray..