Annular vs downleg boosters on carb

OK why would you want to replace a "known good" carb?

thought i said why several times in this thread. Trying to get the engine compartment to the level of the rest of the car. Maybe i am weird, but at this point in my life i not only want it to run as good as it should, want it to look good too
Want to find a carb to do just that. I certainly wont use something that will make it run worse...lol
Which is why i will keep my old carb if the new one wont get to or past its level performance wise, track testing it.