Help with TTI X Exhaust

Thought this was going to be easy...install an exhaust that was custom made for your 108 inch wb A body car....nooooo.

Bought 2 gaskets from napa for the stepdown between the headers and the exhaust pipe ...both same part number ...but were different !

It seems like the pipes are far to long. My X (cross over) is directly under the end of the 727 trans. It also looks like there will be interference with the drive shaft.

Has anyone any experience with this system ?

Thanks
Ian.