advice needed

so, my GT-40 build desires are being put on hold... i just inherited a '90 Mustang GT that is in need of resto. It's my old man's. it was his daily driver. single owner, never smoked in, never wrecked, and most important never owned by a stupid kid... so, my question is... should i rebuild the tranny and rear end? i'm going to bring the car back to showroom condition.
 
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