The last car I did for a customer was a FJ5 AAR clone.

The owner had the transmission and engine rebuilt by another shop BEFORE he brought the car to me. The engine was never fired, nor was the car ever driveable.
I made 100% certain that the owner knew I would get it running and driveable for him as per his request, BUT I was in no way going the take any responsibilty for the drivetrain.
I was a good thing because the engine had lots of issues...MAJOR oil leak, Oil pump failure, decelleration back firing, timing issues, etc...etc...

I offered to help him out, but I recommended he take it back to the engine builder....
I did get it running and driveable, however I never heard back from him as to whether or not he got all the problems fixed.

I'm in no way saying that this might happen here, I'm just adding this so that anybody considering to take their car somewhere to be restored should have a good insight as to each parties responsiblities when outsourcing any componets...