if you can visualize it i wand the exhaust pipe to to come off the headers and then come up over the top rear part of the valve cover and down to were the bell housing would be on a car this all has to run close to the motor. So over all it is going to have to be very compact.
If you don't mind me asking: Why? Sounds rather, well, ugly and like it'll be a PITA to remove the valve cover in the future. Not to mention the intake maniold being in the way and the heat close where you might put your hands when tinkering.
Just doesn't sound like a good idea unless there's a darn good reason for it.