i have a 89 gt 5.0 . theres little plastic clips on the middle back and bottom front of the window. pull the window out and replace them. it should help.
I would recommend buying a high torque mini starter when replacing the stock starter. it is ver easy to install. u will need to run a new power wire from the start cylinod to the mini starter....
The speedometer itself will work but you will need to take the instrument cluster apart and transplant the speedometer unit from the 92 cluster into the 87 cluster. The speedo mechanism is the same...
Since, you did not list what parts or the repairs, I'm going to say you should contact your local Ford dealer and go from there. Next time try being a little more specific and maybe I can give you...