Getting taken to task am I ?? Eleven months after my original post!!

On a new/rebuilt SBF engine, after lots of research here and elsewhere, a HV pump was found to be not needed as there is plenty of volume and pressure on an engine with "good" clearances. I screwed up by thinking more volume was necessary. I also screwed up by installing my pump drive backwards .

The vacuum advance will go back on IF enough clearance can be found around the manifold, water outlet neck and other claptrap hanging in the general vicinity - assuming I can optimize my static timing.