You will get a Better finished look if you remove the boards.
Since the hardware is probably in good shape.
This would be my approach to this project.
Nice looking truck.
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The early bird gets the worm,
But the second mouse gets the cheese
84 Chevy K-20
63 Impala (my high school car)
http://67-72chevytrucks.com/vboard/s...Crew Cab Build