Gilbert, if you can't remove it with a scotch-brite pad lubricated with motor oil then you're looking at a re-bore. I had my Biral 80's bored to 81 and some custom JE pistons with a 9,5 compression ratio made up. Not only is this original appearing, but it's signifcantly less expensive than new Mahle Nikasil 80s. Also, I wanted a bump in compression but only went as high as 9,5 to work better with the reformulated Panther Pee sold to an unsuspecting consumer as "gasoline."
Details here: Good luck and you will find all the answers to your 2,0 questions on the forum.
Jugs and Slugs: Confessions of a JE Piston owner