Wow, this thread is still going. I was the Tom N post also. The funny thing is besides my 84 Impala I have a 93 k3500 Crew cab with a 454 4l80e that I put a Twin Screw Supercharger on to try and match the power my 75 454 had with a Holley doublepumper. So in a way I guess you can use those results however you like to answer the original question and the Hijack. I like to post up what I have done. Not what I think might happen. I have not gone from FI to a carb but I could. I have not gone from a carb to FI, but I could. Last time the Check engine light went on in my wifes 98 Blazer, I went to Autozone, they scanned it, it was an O2 sensor, they loaned me a Crescent wrench, I swapped it out, they used the scanner to clear the message, I was good to go.