7.25 to 8 3/4 conversion

See somebody already did it a disc brake conversion to the front of the car it's large bolt pattern and for the rear in order to get large bolt pattern rims to fit on.. they put these spacers on them to accommodate it... Which I'd like to get rid of... These are the brake backing plates that I have for the 8 and 3/4.... But I wasn't sure about the drive shaft in my mind I would think it would have to be shortened... But if I'm going to need a new drive shaft anyway or shorten the one I have I'm leaning towards just making a large u-joint drive shaft for my car for when it's ready for the 340

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