IDF Flat spot

[factman]

it sounds like your idles are fine if it runs as good as you say but i would bump your mains up to atleast 130 because 3500 rpms is where the transition is from your idles to your mains and your airs haven't even kicked in yet as they come in about 4000-4500 rpms. if sydney is at about sea level then your airs should be fine but the mains are pretty small even for 36 IDF's. does the car fall on its face if the peddal is pressed half way down the you just let it slowly rev up through the 3500 rpm range? if so its definately your mains. just to make sure, have you checked your float level and balnaced your carbs with a sync tool? if not your wasting your time with jets as those are the preliminary steps to making it work right. hope this helps.