its not a 91 motor and 97 chasis, its all 97, motor, chasis, interior... everything, except for the tranny, the tranny is from a 91 del sol...that the only thing thats not 97. my friend gave it to me when he was gonna convert his auto civic to manual, but just ended up not doin it cuz of time n money, so he gave me the tranny when my stock one went out... i found out why my car was stuttering, it was misfiring, n now i have 2 buy a whole new distributor assembly, n the cheapest i found was $250 from the zone and kragen...