Im finally getting a start on my 96 DGGM and trying to find out sum info. I have to take the car for emissions so i need it to be able to pass a OBDII scan. It does not have to pass a sniffer test.First off i not trying to go and have 11 sec B-Body just a good strong weekend car. I will probably go with a 383. So far i have acquired a set of complete LT-4 heads with rollers and a set of clear image budget headers. Im trying to find out will those headers match up to the factorys cat set up? How big of a cam can you go and still be able to keep all the light off in the dash. I dont plan on running the cats all the time just when needed for the test. I will prob run 3.73s in the car. I want the car to run good and be able to in and take a 500 mile trip with no issues. All info is appreciated.