Before tightening the fasteners down, check the thickness of the boy mount rubber shims to the originals. Years ago, I had a customer call me in tears saying his doors wouldn't close and the body was bent, all caused by extra thick rubber beam top shims. He kept tightening the bolts down each side until the whole body was warped so bad, the doors hit the heater channels.
Luckily, by sorting out the shims, it sprang back.