rear end decision-CL finds locally

[tmills213]

All,

Need your opinion/information. The truck is a 64 c20 with a ridiculous gear ratio (still need to verify the exact number) it is running about 3-3500rpm at 50-55 mph. Internals are a 383/th350 up to a HO52 rear. Reading posts on here I have gathered that a 60s dana 60 out of a 3/4 ton with coils would bolt directly in (according to captnfab) and have a (what I think would be best) 3.73 option.

I have also been reading about some 14 bolt options out there. I have locally found some options but don't know enough about them to make a correct decision. I am trying to avoid MAJOR modifications such as cutting and welding while trying to get the rpms down and eliminate one wheel peel. I think at this point i could handle some new perches and maybe a panhard bar.

local cheap option is advertised as a dana 60 but the pictures look like something different. (see pic)
http://grandrapids.craigslist.org/pts/4251076557.html

there are also some like this one but no locker or anything in it.
http://kalamazoo.craigslist.org/pts/4193650334.html
or
http://kalamazoo.craigslist.org/pts/4230417240.html
or
http://holland.craigslist.org/pts/4260795226.html

what do you all think