Really depends on what your Eng is built for. Stock to mild builds are fine running crankcase evacs off the Valve Cover to a breather or base of the carb etc, using a PVC in line.
But if your going with any amount of duration on your cam, rumpty rump, you will have problems with vacuum. Now depending on how much your running it, hi RPM etc, will dictate through the headers evac (mostly racing) or vacuum pump $$$$.
For mild street strip builds, the electric Ford vacuum pumps are fine, its when you get into sustained hi rpm runs that they cant keep up.