Took the GTO home yesterday, and now I'm going to drive it all week to get the ECU to learn its new motor.
The boy and my dad almost came to a screaming match when my dad insisted he'd left the bolts for the driver's seat on the floor in the back of the car, and the boy insisted that the same bolts were the ones he'd left there when he took out the passenger seat (we needed to get the seat out in order to get the shifter porch adequately adjusted). Turns out dad had left the seat bolts on the radiator core support, and I spent 15 minutes getting the rear seat out (and then another 10 getting it back in) for nothing.
The boy got an apology, but yeesh.