I did the job you describe on my `87 F250 which is probably the same. The shroud you describe as being held after removing the screws is the one with the key switch on it. You have to rotate the key switch as you pull the shroud off. It should come off easy. You can then see the actuator with the gear teeth and the one that connects it to the rod running down the column to the starter switch. There is a long pin on this actuator that goes thru a slot and operates the Park lock. You will probably find this square section pin is now broken. Remove the bits and fit a new actuator, about $6.00 from Ford. You have done most of the work so why not go the full 9 yards.