I've thought about that conversion myself. I've been told the cross member would need to be removed or modified where the clutch housing mounts are now. You'd probably have to change to side mounts on the 235 engine and possible fabricate or modify the rear mount for the automatic.... As far as the rest yes the torque tube is the same length in the 1/2 ton pickup and the car.
You'd probably also want to change the ring and pinion to a 3.55 ratio over your 3.90 or 4.10....

John