You use the word "classic"; if you go hopping it up it will no longer be a classic. Perhaps you want to turn it into a "sleeper"? From a technician's standpoint, if it isn't broke, don't fix it. If you go doing any work like cylinder boring, that's removing metal that can only be restored with major work like re-sleeving. Check your tolerances & keep to as close to the original specs as possible. The Germans are marvelous engineers & the Bug is a remarkable piece of retro technology, survivable, tough & easy to service. I'd love to find one in new condition. They've got real personality... it was one of the first cars I learned to drive... & they are the original economy car. Just make sure that everything's healthy & in good condition if you want to maintain the value. At least in this country they've been out of production for quite a few years.