727 or 904?

UMMmm
Unless you blow a driveline, axle or ring and pinion. If that day ever happen to me. My trans will not go back under power until its torn down to check for damage. i value my legs

Then make sure all those things are right. If it's a serious race piece, sure have all of the right stuff in place. A street car will rarely "blow" a driveline, as long as it's not a 7.25.