The location you are looking for is called a "ported vacuum port". The stock 1 barrel and the stock 2 barrels that came on the civvy motors as well as the stock 1 barrels that came on the mil engines had no provision for ported vacuum.
It might be possible to open up a ported vacuum port as was shown in the other thread for the 1 barrel but I cant really say if it is or isnt at the moment.
Lord send your Holy Ghost into our hearts and make the desire of our hearts Your Will.
Pro-choice, that's a LIE, babies don't choose to die!!