Is there somewhere I can go or a web site that decodes the upper portion of a build sheet? Such as the boxes 1-106.

really? wow if there is can someone let me in on the info also?

What year? When you say 'decode' the sheet, what are you looking for? For a '70 (and I'm sure others), many of the boxes are simply part or code number for installation pieces such as 'CE' Throttle Cable (blk 102) or '3566' Shelf Trim (blk 81) while others are pretty common such as 'R59' Battery (blk 49) and 'TX' Engine (blk 27).

Anyone with info on specific codes such that aren't so apparent such as 'AD' Crank Pulley (blk 35), any help along these lines would be appreciated as I'm trying to put together just this type of information now.

See http://www.chevellestuff.com/tech/70_build_sheet_decoding.htm