It is a little hard to tell due to the lighting of the second picture, but...
It appears that the column tube is installed backwards. That plastic part at the end of the tube holds the lower shaft bearing at the bottom of the tube, then at the other end (after you flip it around) you slide the plastic ring over the column, then the ignition switch assembly goes on.
The plastic sleeve is screwed onto the column at the other end by three short sheet metal screws (phillips), the ignition switch assembly is held on by two or three bolts that go in from the horn side, I think there are bolts on the other end. It's been awhile since I had mine disassembled, but I remember how it goes together!
From the horn side of the ignition switch assembly, where the shaft comes through, there should be a bearing in a rubber sleeve (I think I can see it from your last picture), this goes over the lower vertical ribs on the wheel end of the steering shaft. Inspect the ribs on the shaft to see if they are mashed flat or not. If they are, the upper shaft bearing (in the ignition switch assembly) won't press onto the shaft tightly and will cause an unbelievable amount of vibration when slowing down from freeway speeds (50 or higher), that's what mine was doing. If that's the case, you will need a new steering shaft. Here is a thread I started a few years ago when I had to fix mine:
http://www.fordpinto.com/index.php/topic,8070.0.htmlBEFORE you put the steering shaft through the firewall, be sure you put the rubber cone boot on the inside of the firewall first of you will regret it when you feel air whooshing in on your feet!