Too get to that takes a shit load of money and time. To do that to OEM dual carbs seems to me like a nightmare.
If I had to do it on the cheap though, I would isolate 1 group of hoses @ a time, disconnect and put a rubber plug on ONE vacuum hose @ a time, and then run car to see what does or doesnt work right , then on to the next isolated unit. WRITE IT DOWN, and take lots o pictures
But Ill go 1st. You can disconnect the Charcoal canister and remove it completely, dual separator hoses need to be open in order to breath. Plug where it goes into the "T" until you figure out the next one to remove block/reroute/plug.