Need HELP identifing a frame

[ScottH]

Well I got caught in what appeared to be a great bargin and may have bought something other than what I thought I was buying. I was the high bidder on this:

http://cgi.ebay.com/ebaymotors/ws/eB...177564868&rd=1

My idea is to have a great start on a 4x4 shortbed, however I just found out that Dana 20 transfer cases came in blazers. Can anyone tell from the pics if this is a truck frame or a blazer frame??? Also seller noted that the frame was shortened 5" for a custom flat bed, so either way I may have to deal with some frame changes.

Any help is really appreciated. Don't think I went wrong considering the money invested, but need to know what I bought.

Thanks.

Scott