Hey guys. Second time here. My friend and I just switched his 1980 malibu drag car to open headers. Ignoring the obvious which is that the carb should be rejetted, I’ve got a few questions. First of all, how many steps in jet sizes should we start at? Also, after doing a 6k pull, the backfires hard on decel. I figured this makes sense since there’s nearly no back pressure to keep unburnt fuel in the cylinder but my buddy is kinda worried and I figured it cant hurt to pick the brains of people with a lot more experience on this stuff. The car has a 383 stroker sbc with 10:1 comp and a roller cam. The thing is scary fast but we don’t wanna cause any damage. Thanks in advance!