Still waiting for proof about MSD 'lies'. A statement from you proves nothing, because 90% of the time you are WRONG.
And on what page does Urich say use 1/2 of the idle vac for the PV?????????
He says this on p. 129 as a tuning example; 'If a 65 PV is in the carb & vac occasionally drops to 5" of Hg at idle or part throttle, install a 4.0 PV'.