As Rex says, valve timing is pre set, so why do you anticipate problems?
I hope you are not thin skinned enough to take offence like so many do, when I feel your skill might not be up to par if you have to ask such a question?
As always, read the manual first, plenty of BSA stuff around, and study the parts lists which are very informative. as to what goes where.
nice bike, easy to work on.