I bought a 08 motor on after reading the forum here and seeing that guys were swapping them out with few if any complications. I have one. The valve covers are different, which ouuldn't generally be a issue other than the 05 has a tube that drains back to the block and on the 08 casting there is a void there but no hole. it this swap possible? Did you just do some plumbing mods to get this swap to happen?