Some of the cams made are not good if you plan to continue to drive the
car on the street. They have too much valve overlap and thus not enough
vacuum to operate things such as headlights, wiper doors, heater/AC
controls and distributor advance. On older cars like my '63, the only
consideration is vacuum advance which is disconnected and the
mechanical is set for 38 degrees total.
If you are going to continue street use buy a small, electric vacuum
pump and a small tank. Attach the main vacuum feed from manifold to the
tank, except fot the advance line, and all systems should work.
Checking the existing lines for cracking and leaks will help things