Here's some info that should help you as detailed in my book "Dodge Trucks 1917-2002" by John Gunnell.
1970 D100 Sweptline shortbed cost $2,667. weighs 3,477 lbs*
1970 D100 Sweptline longbed cost $2,704. weighs 3,822 lbs*
Of that D100 series, they made 15,978 shorty's and 38,857 long'uns.
:-)
*based on a 318 v8
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Dodge Sweptline Truck General Discussion