Do you think I should re arch them and add new shocks?
Cold or Hot re arch?
Depending on what your final goal would be as far as how much more weight your putting in and how you expect it to ride when you are driving it.
If you are stopping with what you posted then you could just put in the shocks and see if it rides like what you want.
However I would wait till you do the drop kit to change the shocks though. Shocks have an intended internal travel and changing where the truck sits could effect that internal travel. Lowering the truck would basically make the shocks shorter and could bottom out also, depending on how much you lower it. Different shocks will perform differently depending on how they are made and for what type of ride(not the vehicle but how much shock they absorb) they are for.
We don't do the arching here, we outsource it to a place that specializes in it. We basically tell them what our customer wants for either ride stiffness or how much weight.
If you do have the springs re-arched and you have a place do it, let them know you plan on dropping it, the place might have a better suggestion as far as what to do(how much arch to add, adding additional leaves, etc)
I am not saying you couldn't do it and having a place that specializes in it might cost a little bit more but from what we have had done to many trucks, it is worth knowing it is done right and with the proper equipment and will last for probably longer then you will own it. I also don't think you would want it to sit lop sided and/or eat tires because the alignment is out of whack.
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