Just bought: 69 CST/20 beater with pics.

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Got home last night after about 450 miles round trip to get this one. I don't know the actual milage since the cluster was swapped out at some point, but i don't think it is very high judging by the seat, pedals, arm rests and general wear and tear. Seems to run good, posi digs 2 holes (on the snow). Can someone tell me which rear end this is?
I assume the truck is an early cst since it has no headliner, and no cargo light. Same as my other 69. The glovebox spid seems to match the options on the truck. The c-20 emblems and the 2 different gvw ratings are throwing me a little, since it looks like an original paint truck. Any opinions on this? Also looks like there was never a rear view mirror attached to the roof? And what is new car conditiong???? Anyhow, here it is.