Hi and welcome to mightyram. The only vacuum circuit you need to keep connected is the vacuum advance for the distributor. The brake booster is running straight off the manifold, the crankcase ventilation is the same. There is a vacuum switch under the thermostat end of the intake manifold. It has no 'vacuum' inside of it so you can either just disconnect the hoses or physically remove the vacuum switch and fit a threaded block off bung in it to tidy it up. You will need to block off the coolant line from the barb at the heater hose as the Weber has an electric choke and the coolant feed is redundant. Check the threads and pics for references.