1971 chevy extended longwheelbase

[dagwood]

i have recently came acrossed parts that once where on a 1971 chevy extended wheelbase truck. In which i heard this truck was supposted to have a 402 c.i. engine. From what little information i could find on the internet, chevy extended some long wheel base trucks an additional 8 inches. i was wondering if was supposted to be a rare truck? i heard the bed from the 71 chevy is still around and in good shape.
Thank you for your time