welcome to the garage 55 - you'll find a range of opinions here about that, but mine is just take real good care of it like you would w/ any vehicle that you'd like to pass on to your kids and grandkids - keeping it as 'unmolested' as possible will be better for the long run
sounds like you've done all that's needed, so just take normal good care w/ it and if you really want to keep it 'pristine' as long as possible, drive it 'regularly' but don't put a lot of miles on it - one of the worst things for a vehicle is to sit for extended periods, it lets seals dry out, grease migrate to the bottom of things, sludge to set up in the pan and top end, etc
Bill
