To go from Tag Sprint to Road race isnt much to do. Gearing change like Ray said for most Tag engines and tracks this will be a 16T driver and sometimes a 15T. Lay back your seat so your not sitting so upright. Front brakes are always good to have.
What Tag engine you run? If you run a Leopard you may want to get a road race clutch.
What series do you plan to run with?