1973 Gas Tank and Emissions Tank, Etc

I have a 73 240-Z. Restoration getting out of hand, but I shall see it through. We dropped the gas tank and have the interior panels out. I am wondering what items can be eliminated completely or closed off with plugs, etc. There is a tank in the cargo area on the right side that is probably useless...maybe some of the gas tank fittings as well. I am running earlier SU carbs but have a new set of Weber downdraft carbs to install if they are a better bet. All comments appreciated...Ryals in north Georgia