Ok being a newbe here I'm still figuring out the site.
Here's a pic of my 83 D100 short bed as I bought it and believe me it was a silk purse made from a sow's ear!
It has a 77 360+4 904 and measly 8 1/4 rear I believe the 360 is a marine engine as it has pet cocks on sides of block and has standard rotation cast into back of intake manifold.
I now have it on stand's in the garage with complete front clip removed do to excessive rust that had been hidden with aluminum foil tape painted to much area it was covering.
I have a diff front clip to replace original one.
I am rebuilding the 904 as well as it burned up do to rubber cooler line blowing out.