I think with the 8" canton, I am probably 2" under the rail. You can sort of see it on the right side of this pciture
http://www.cobralads.com/timing/DSC00014.JPG.html
I know that Robert and Jay went with a custom
Armando pan and they have about an inch more clearance than I do. I may go that route in the future...perhaps Armando could even come up .5 to 1 inch more. Your system looks sweet...as high as dry sump.