Manual to power window conversion 87 Caprice
 

Can I convert my manual windows door panels on my 1987 Caprice to power windows oem door panels

you bet. 2 ways to do this:
1 get all the parts from a model that had power windows
2 buy a kit that installs onto the manual door linkages. this is probably the easier option of the two.

search this
manual window to power window conversion kit

Manual windows in my older chevys are quite useful when they are stored for long periods of time without a battery
They allow me to open the windows for a few days at the time to let fresh air in without having to hook up batteries ;)