Is the spoiler a new after market or from 1970's ? Thinking about its materials or compositions and what plan of attack.
It was added somewhere along the way. It is molded fiberglass. If I use my heat gun and get it up to about 150 degrees I can get it to bend. Have left it in a jig with clamps for several days. It will retain the new shape for a few days but then return back to a smiley.
The Ford spoilers tended to warp
Did you happen to notice part numbers on the bottom of the pedestals when you had it off?
Ford spoilers were two halves joined together and are hollow