Changing out an older 340 motor to a newer fuel injected 318

As anyone out who follows my threads knows my daughter was involved in a serious rollover accident two nights ago. The good thing is she will be OK. The bad is that the insurance company will not be paying me for any losses on the vehicle. So a Question please. My Duster needs to have the 340 pulled and sent out to have work on the block and the 318 in the Durango is rock solid and runs like new. So what's the best way to swap out the blocks. Just exchange all the carbureted manifold over or to change out the EFI system. Airbags did not deploy and truck starts and runs fine at idle. I ran the engine today for 30 minutes and it is just as good as it was before the wreck. Any assistance with this procedure would be most helpful. Thanks in advance