Here are my old barrels, pistons, and gudgeon pins, from a 1978 Le Mans Mk1 850. They are very dirty and smoky as the bike was in a fire. But they are undamaged, with all fins intact, and the bike had done around 22,000 miles.
I think they will clean up nicely, and as I am replacing them with a 950cc set, I offer them for sale, as they are, for £240.