Does anyone know of a site w/ what came in what emission packages? If you just happen to have a book of em I need to know what was in these 1987 packages ZHA ZJF ZJC ZJL Also what particular vehicles did the ZJC and ZJL come on? Finally, I know that no 4wd 3/4ton 'burbans came w/ the 454, did 3/4ton 4wd come w/ 454's? Im lookin at the emission badges for my engine swap, and need the one to make it at least appear legal, but puttin the least emission equipment on it necesary. I got a 3/4ton now that has half ton emissions on it, (AIR injection and CATS) but the burban im gettin the engine out of has true 3/4ton emissions, (only AIR pump), and we've had a 1 ton before that had no emissions on it. Any explanations of what is in these packages is appreciated, and I know there are 50 questions in this post. Thanks.