Check the sticky threads. A pair of L-450 3.6H neck pickup and 4.8H bridge pickup would be a nice pair.
A rawer version is a pair of L-495's ; 3.6H (n) /4.8H (b)
You do not have to change pots. Soundwise it's just a matter of taste. The quality of the stock pots is another issue...If you like the sound you get with you current pots after installing Bills pickups, just keep them.
If you can afford it, change them, because they must be removed from the guitar during pickup swap anyhow.