First of all, its always best to discuss your goals with your tuner.
Unequal length header will slow your spool a titch. 350whp on what dyno? where? All dynos read differently. Turbo wise I suggest a HTA68, spools like a 16g with 18g type top end. Fuel pump and then 1000cc injectors would be wise because they would allow you to use e85 efficiently and give you wiggle room.
Other possible mods could be tgv deletes, external wastegate, ebcs, and then some sort of solution to battle heatsoak.