I don't know if this was the right thing to do or not, but I used the aerosol version of airplane paint stripper on the interior panels on my 65. First picture is before, then second is after.
After the paint started bubbling, I used a soft plastic scrapper and shop towels to remove the black paint. I repeated the process until I got all of the black off.
If you do use this product, make sure you use it in a very well ventilated area and possibly a respirator and do not let it contact your skin. It does burn.