Hello guys

I am new in the forum, I have been around cars for a few years now I do my owns restorations as far as I can, by now all my experiences are over my Volkswagen but I also have another german toy a 1972 w108 280S, saddly at this moment I have to repair the engine and I am looking for help in this forum.
The car is smoking and a broke head gasket, so I have to rebuild the head and replace the gasket. My main problem is what to do with the engine since this is not may daily driving and I put just a few miles a year, the mechanic sugest new rings and gaskets, another friend told me not to do that, instead he sugested to bore the cylinders and change the pistons, keeping the bottom end since there are no stranges noises and the oil presure is steady at the maximun values even at idle.
What do you think about ?

Thanks in advance