Dubob,
Thanks for the reference It looks like I need to go towards the passenger side a half inch. The difference of 2.5" between the frame rails would leave me at 1.5" from center line and that sounds like I heard that before.
If you are using the 360 magnum passenger and 340 driver manifolds I can measure the gap between the passenger manifold and the inner fender. That should put you exactly where you need to be. '69 Barracuda, 318, 360 magnum (large hole) manifold and 340 driver manifold.
