Hi Andy
The only thing I can think of is you changed the transmission mount it may have put the trans closer to the crossmember
You may have to put a few notches in the crossmember for the larger diameter shift rods from the Super Shifter so they clear.
Gus


64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60