You don't drive / Start >the car often and those Cars Carbs drain down > evaporate fuel
making for a Low fuel situation for cold starting after sitting and that's most likely the main reason for the rough start /Run after " Sitting " You can install an electric Fuel Pump at the rear by the tank a low pressure pump and no more problem .
You turn on the key and wait until the fuel pumps up "about 1 or 2 mins " then start it.
Also check your heat risers in the exhaust Manifolds making sure they are operating or your going to suffer slow warm up issues / Best fix for the Carbs adjustment is to have someone familiar with them do the adjustment or if you want to learn bring tools necessary and drive and set the Carbs until good this may take several settings before satisfaction as they are tricky and require first that all the linkage is in good aliment and not sticky at all < without this the Carbs > will not return to the same exact place upon releasing the Throttle loosing *** " synchronization " *** a must with dual Carb's IE : Without the linkage being correct the the Carbs and not correct. As a further Example if your linkage is not perfect then you Carb synchronization is also than not perfect < Lubricate all the parts of the linkage and you will discover binding area's .