Ok I just got my 302 running in my 71, I think I need to tweak my carb a little. On the freeway when Im holding a consistent rpm say 3000, I can hear in the exhaust a sort of a popping, kind of like it would if I was letting of the gas and a real minor hesitation thats barely noticeable. At Idle it runs real smooth, but there is occasionally a similar pop in there, its not like a loud pop, just a little grumble. Ive check all my plugs, but think I might get new ones. Also when I jump on the throttle it hesitates just a bit. Now I had the same 1406 Carb on my truck and replaced the needles on it, am I on the right track? Any tips for a guy? Thanks for the help guys, youve always been a good place to turn to for advice like this.