Welcome to Mightyram50 - unless the lines are really rusted, there is no need to replace the fuel lines - just flush them out to remove any gunk from old gas. The return line from the carb can be capped, and make a block off plate to cover the manual pump hole on the side of the head. All the vacuum lines can be removed, except the vacuum advance for the distributor, and the big one to the brake booster. Mount the pump as close to the outlet of the tank as possible, with a filter before it to catch dirt. Be sure to plug the coolant port on the manifold with Allen set screws coated with red Loctite to avoid leaks of coolant into the intake. We also love pics - condition not important...