Pop in a new neutral saftey switch as you do not want it to be able to start in any gear, that is dangerous.
Then go down to the trans shift lever on trans with the linkage diconnected and put that in Park. Then have someone up top put the Selector on Park so it lines up, then you underneath adjust the linkage so it drops into the park lever.
Make sure you have the proper sized ends on the linkage rods to fit well into the shift arms so it is not slopping around.