The problem would not be with the chassis year, it would be with what your scanning. When your entered in as a 97 and DMV noticed that computer being scanned is that of a car/ecu with Vin recognition red flags go up.
At that point its not a visual/sneaky paper playing game like it is with a pre 96 car when being plugged in is not the problem, just knowing someone that will overlook the fact that the completely wrong motor is in the car :rofl
WHen your dealing with scanning the computer, and the chassis is completely differant then what the computers reading from the ECU it throws a shit fit
Something like that… im sure you can get the gist