I don't think it's clear why you want to make the change? Is it a real V code car? Are the carbs original numbers matching carbs? If so, save the carbs. Are you going back to vacuum secondaries to restore it to stock appearing or because it has a hesitation on the takeoff or not running as good as you want? If so, switching to vacuum secondaries is not necessarily going to make it better running? You just have to gave the right setup for your ignition, trans and rear ratio combination. Change the rear and change the carbs and you could end up being disappointed in it's performance and how much money it cost to get to that point. Are you planning to put 1000's of miles on it? Drive it anywhere you want with
the 4.10's. You'll get used to it and it's fun! Just some food for thought. Otherwise, make changes one at a time to your complete satisfaction to better measure the results of your changes.