Exhaust Nightmare!

The Sanderson DD7 set cost me $367.00 through Summit - picked them up at the Talmage Ohio store. They are shipping the DD8 driver side directly to me. We shimmed both mounts 1/4" when trying the DD7 headers. So pulling that 1/4" out of the passenger side will tilt the engine enough for the magnum manifold to clear the steering? I can't get my little finger between the manifold and inner fender on the passenger side now - dropping that side would make it hit! This is a 318 with 360 heads, the manifolds that came with the engine were from a 1/2 ton van. I have a set of 273 manifolds, the outlet diameter is a lot smaller than the 2-1/8 magnums - can't see how those would flow well!