I have done this swap. Column out of a 67-72 is easy. Columns out of 70s-80s vans are the same. If you are running a long tailshaft 3-speed, use a short shaft turbo 350 and driveshaft length will stay the same. If your 3-speed is the un-synchro low gear, you will have to change front yoke. You will have to cut the crossmember where the old bellhousing sits,for clearance. Rear mount will work on crossmember where e-brake mounts. Many ways to go with coolers. If i can help just holler.
