Hi Bergie,
The 500 is an engine that likes to rev, so don't worry too much. I raced one for quite a few years, and there is nothing really that comes to mind apart from regular maintenance, eg tappet settings and regular oil changes. By that I mean change the oil every 1500 miles, no longer. I use Silkolene Chatsworth 40, but if you are to use it in cold weather, then a straight 30. DO NOT use synthetic, they don't like it.
Glad you liked my website, currently in "The Classic Motorcycle" on the front page are 2 of my 1966 Bonnevilles, with a 7 page article inside, hope you like it,
All the best
Hugh
PS as you are re-building the engine I would fit a Morgo plunger oil pump as that is the main heart of the engine. I can't believe how many people use the old pump 35 years old or more !!! Also I fit a Boyer MK 3 ignition (non digital) , fit and forget, however if you go down this route, change your coils to 6v, works better.