OK so I have been reading up on this mod and for those of you that have them please chime in and see if I'm way off base on my thinking or info interpretation. First thing I have been reading is once you install a thunderjet the next step is to throw away the S&S tuning instructions because you have a totally different animal now. My first question is the external air bleed, am I correct in saying this is only required on the older carbs due to the new ones already having a internal air bleed thats adjustable. The reason its confusing to me is because the air bleed sizes are totally different between an internal and external air bleed. I'm also seeing where they say that the idle mixture screw may only end up 1/2 turn out or so and hardly any accelerator pump adjustment will be needed. The common idea also seems from my current jets is to go up on the intermediate,down in main and up in air bleed. Also last question maybe hdlarry,LDO could help, just for comparison reference what size intermediate,main,air bleed, and thunderjet are you guys running,and is your air bleed internal or external. OK here is a quick edit I'm reading now that maybe the thunderjet kit comes with a screw plug that you block off the internal air bleed and then you drill the carb body for an external air bleed? Sound correct?