I would keep the FP4 and try it out. I use past dated film all the time that I have stored in the freezer and refrigerator then brought it out and let it stand for an hour or so before use. As long as it was sealed properly while in the fridge it should be ok. As for the ektachrome, well try a bit of it and see if it's still good. I have a friend that shoots past dated chrome film all the time and has onlt had a few rolls that had any kind of shift to them.