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Fun-
Congrats on a great purchase. Others may pipe up with a lot more knowledge than I have, but I will try to answer some of your questions.
Restricted carb rubbers were used in some of the early T-birds with Mikuni carbs. I think that by 1999 all of the T-birds were using Kheihin carbs. "Tweaking" the carbs can mean a couple of things, Usually folks who put on less restrictive exhausts richen the mix by changing the mixture screws (to 2 1/2 - 3 1/2 turns out). You could probably tell is these had been adjusted because the mixture screws are covered at the factory by little aluminum caps (aka EPA or "Dork" plugs). If you use a mirror to look at the bottom of the carb bank and see the screws, they were tweaked. Typically that just helps the bike run a little better and pop less on deceleration. If you want to improved performance you have to rejet the carbs. You can't really tell this without tearing down the carbs, but for a re-jet to be really effective you have to modify the airbox too (by adding holes), and that should be visually apparent.
For more on all of this see Jimmy's article entitled Tuning the Hinckley Classics in the Downloads section.
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Speed is good. It is way better to be shot out of a cannon, than squeezed out of a tube. That is why God made motorcyles.
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