Ideally, you want less exhaust pressure than intake pressure. A lot of it depends on the turbo manifold design and size of the turbine wheel and housing and exh pipe size exiting the turbo.
Here is a picture of the header, and the turbo is a 66mm Turbonetics that was used on a Buick Grand National that routinely runs high tens. My engine and that one have virtually identical displacements. Maybe it will work...:prayer::prayer::prayer:
