I swaped in my 435 when I put the engine in. I started with a small hole for the shifter. Cut it bigger, and bigger, and bigger. I finished by removing most of the top of the tunnel cover. The I had to cut a little off the bottom of the front crossmember on the drivers side. Then it fit.
The shifter was done without bending. I cut it off just above the ball. Cut about 8" with the first bend in it out of the lever. Then welded the lever together at a 90° angle. It now cleared the stock T-case shifter. It also shortened the throws. The heater box clearenced itself the first time I stuck it in granny (that is where to cut the lever at).