I know the outboard line on the fuel pump feeds the vacuum for the wipers and then on to the heater.  I am converting to electric wipers and I believe I can change the heater away from vacuum controls (checking on that).  My question, what is the inboard line on the top of the fuel pump feeding?  As I have been working on bringing the car back to life the original fuel pump vacuum ports were connected together with a small hose and didn't run anywhere? 

I do have the power brake booster (which wasn't on the car originally) and I need to find a vacuum source for it.  I am using John Mummert's intake manifold if that matters. 

After 5 years the car is almost done and then off to my daughter as a present!!!