This is helpful to me as well. I have a 73 240z running all the finest emission controls of the early 70s! Trying to move to earlier carbs ( once I get a few runs with my flat tops thanks to SteveJ for the floats) but trying to see what it will take and what exhaust options there are. Good deals on the pace setter headers so I'm considering them as well. I have been hunting for my z for 20 years and excited to talk options with one of my own. Cheers all Sent from my iPad using Tapatalk