How to take a the vacuum diaphragm on a 1991 Chevy 305 w tbi?

I want to swap from the original air cleaner to and open element but am having trouble with what holes need plugged and how exactly to do so I have everything drilled into place and fitted correctly with the hose that connects to the diaphragm just sitting unplugged and the one that connects from the diaphragm to the air cleaner plugged

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