Diesel Bombers - White smoke rough idle?

Hi guys I am new to the site and somewhat new to the cummins world. I am going to make this as short as I can. To start off I have an 06 mega, raptor pump, smarty, 60hp sticks, intake, exhaust, 6 speed, anyways I was pulling a 10k load up slight grade when the truck began to pop and misfire with an excess amount of white smoke so I turned around and began to limp home and while doing so the issue cleared up and the truck ran fine until the next fuel stop then after 10 minutes back on the road it started acting up again on the way back to the house. Turbo was shot and I figured I had two bad injectors due to the cylinder 4 and 5 misfire code, so I have replaced all the injectors and valve cover harness also put a BD turbo in. Now the truck is still throwing a cylinder 4 and 5 misfire code along with white smoke and rough idle.:argh: :argh: I don't have excess pressure coming from the oil cap or anything like that so I don't think I have burn't a piston. I also checked all connections and wires to see if any were exposed now I am out of ideas. Sorry for the long post any help would be greatly appreciated thanks in advance :c: