I had all sorts of issues when I installed 2 years ago, Had to shim one side, had to ding in the pipes to fit (made me cry to dent such nice units) in several places: PS steering shaft coupling, drivers side frame, passenger side torsion bar, I had the header in and out numerous times....... may be I shifted the engine slightly when removing/installing the rebuilt trans.....I know I have several very close areas where the header pipes may hit....