If you have another vehicle, do all the body and paint work while the engine/trans is out of it. Much easier to detail the engine bay with it empty. And maybe more money will be available after that for drivetrain. Plus u have some deciding to do, so it will also give you time for that. If you need the truck immediately, everything I just said is nonsense.
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1971 GMC Sierra Grande 2WD 1/2 ton, 350/400 auto
2008 Chevy Silverado 2WD 1/2 ton LT1 5.3L auto