99T/A

Ok guys I have a friend that has a LS1 Formula. Not sure of exact year. He lost oil pressure and has a complete L92 ready to go in. The L92 has a LS7 cam that he installed along with springs and supporting items for that cam. Everything else on the engine is stock but he is going to do headers while he has it out. How far out will the tune be on this swap. Is it something that he will be able to drive to get tuned or will it not be driveable until it is tuned? Any help would be greatly appreciated. Thanks in advance.

Chris