I just purchased a 99 Suburban with a rusted out, crappy body but a perfect interior. I have a 93 with a perfect body but a trashed interior. I am planning on using the 99 interior in the 93 but there are many challenges I can foresee and need some answers. First, how will the connectors work? Since the 99 is Vortec and the other is TBI - One is OBD1 and the other OBD2 - The newer one has a Tac, which I want, and the other does not. Also, I would like to still use the TBI but get the advantages of the better heads and the roller cam in the Vortec. I also have manual windows and locks in the 93 but the 99 has power, so How hard is that to change over? I could just swap the entire engine and wiring harness but the 93 is a 3/4 ton with the 4L80, which I obviously don't want to give up. I realize I could go multi-port and get rid of the Spider pop its, but the TBI is so much simpler and this will be a hunting rig and simplicity is great when you have problems in the mountains. Basically, I have a mess on my hands and I'm looking for some sound advice. I'm leaning towards pulling the motor from the 99 and keeping my OBD1 and trying to figure out how the heck to wire all that crap, but WOW. I have never attempted anything like this before.