The revalving is usually not required with H.techs, but it would help. Unfortunately, I do not believe the stock dampers are able to be revalved. Depending on how many miles are on the OEM suspension you can get quite a bit more miles from the OEM dampers and save up for improved performance shocks down the road.
Camber shouldn't be an issue either with the H.Techs. If you need more camber adjustment the
Hotchkis rear links are very good.