It's funny how many times in the past that this has been covered and we still go around and around with it.
Get a Morgan Carb tune and be done with it. It's the best one on the market and it will give excellent results for many years. The problem is there is no way what you have is going to work one gauge. Each adjustment you make will cause the other three cylinders to change. You will be chasing it all day long and never get it right. Opening the taps might keep the needles from jumping, but they also allow different amounts vacuum through, so the readings are not the same. You need a reading for all four ports at the the same time.
After you finish your day long sync-fest, take it to a somebody that has a Carb-tune and you will see how far out sync they stillare.

 

Thanks for your comments stray cat

Mate it works fine for me.took me about fifteen minutes.

one thing I might add, because all the readings are taken on the one guage you will find it is more accurate unless all your gauges are calibrated to each other regularly.

Thanks again.