Re: Rear end
Just a quick two cents worth. 40 years ago GMC pick up trucks weren't engineered or built to run comfortably at 70mph. They were mostly designed to be work horses. And if I remember right, Chevy 283s weren't designed with lots of torque and didn't lug down well, but instead did their best work, or like you say "happy range" when the rpms were a little higher. Others here might know the exact rpm numbers, but I'd say they were most happy somewhere around 2,800 to 3,200 rpms.
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