i have a 1987 Monte Carlo LS with the 4.3 TBI in it that my uncle bought in 93. He has since passed of cancer and my father obtained the car and is now also diagnosed with cancer so I’m trying to finally get this car going. The 4.3 that is in it is the 2nd engine this car has had and is knocking. Again. Go figure 🙄. I have decided to 350 swap this car and go carbureted because I’m sick of the TBI extra crap. So, I’ve been doing research for days and nobody seems to have answers specifically for what I’m doing. Some things yes, some no. I do not have wiring diagrams like other guys and I’m not exactly a wiring guru like some guys. I’m going to be running a 350 with a edelbrock 600cfm carb and edelbrock performer intake. I already know that the engine mounts might need moved and I know I need to do all new exhaust. So that’s out of the way. I know the fuel pressure is different however I’m keeping the in tank pump so I’m thinking a fuel pressure regulator at the carb with a return option. The car already being fuel injected has a return line for the tank I believe. The transmission is a th350. As of this minute it’s unknown if it has a lock up converter or not. I’d have to find out somehow. (Yes I know the common trans is a 200r4. I got under and looked and mine has the 350 trans.) so I know that will work with my 350 just fine. I want the speedo, and ac and heat and cruise etc to all work. The car only has a fuel gauge and a speedo gauge being as it’s an LS not an SS. So my questions mainly pertain to the ecm of the car. Do I simply leave the ecm in place and everything will work normal but engine light would always be on? Or do I remove that ecm from the right side kick panel? What do I need to do to make sure the fuel pump keeps pumping, cruise works, and of course gauges and ac etc. i need some guys that can give me answers. And dumb it down a little for me too please 😂 Too many people keep saying “Google it” or say that there’s tons of forums already on this topic yet I can’t find any that are answering my questions. So I am posting my own. Any help is appreciated!! Thank you guys.