1970 Buick gs stage 1

1970 Buick gs stage 1 455 automatic w a 12 bolt w4:11 . I have the factory 10 bolt w 3:42 gears.The vin# conforms it's a stage 1 engine and trans are not numbers matching...car runs and drives needs resto nice project car...most of the interior is there missing original seats and console it has racing buckets no carpet...