[bouncytruck]

Upper trim is added - not original. I've never seen a "super" emblem on a blazer. I have seen Cheyenne Equipment listed on the SPID, but I'm not sure if it is how they listed CST or if it is some other options. First Gen Blazers never came with big blocks. To install a big block, there was most likely some modifications done to the fire wall or the engine is sitting in the forward (2wd) mounting position, which would move the transmission and t-case forward as well, shortening the front driveline. I'd look very closely at that truck - it sounds like it has had some modifications in the past and the current owner doesn't know what has been done.