"None of the above". Don't drill any holes in the intake manifold. Just cut a hole about 1" in diameter in the back of one of the valve covers and put in a rubber grommet that the PCV valve will slip into snugly. Make a sheet metal baffle to fit inside the valve cover to prevent oil splash from getting pulled in by the vacuum. Some PCV's have a 90 degree elbow built on that will help with firewall clearance. Run a 3/8" diameter vacuum line to the port in front of the distributor. If necessary, drill and tap the vacuum port in the manifold to 3/8" pipe, and install a tee with reducers down to 1/4" NPT on both sides. Run the power brake hose to one side and the PCV hose to the other. Use a vented oil filler cap to get air into the crankcase.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!