The search function is not working at the moment so it is a little hard to find what I was going to link for you.
Somewhere towards the end this thread Glock35ipsc started talking about doing the truck arm conversion to his square body. There were some good links and info about the kit and the other ways to do it.
http://67-72chevytrucks.com/vboard/s...d.php?t=350986
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69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been
https://67-72chevytrucks.com/vboard/...d.php?t=484426
69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc
68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E