I am swapping out my 305 for a 350 in my Firebird and I am confused on the correct ECM for the 350. The 350 is coming out of a boat and I would like to swap it over to EFI. I currently have the 1228063 ECM in my bird and I have read that most people swap out their 8063 for the 8746. However, the 8746 is designed for the 305 not 350. I have looked at the 1228747 ECMs and those are for 5.7L trucks/vans. Would this ECM work for the 350 and if so, would I need to get a whole new wiring harness for the 1228747?

Right now I am just completely confused on which ECM would work for my 350. Any help would be much appreciated. Thanks.