I have a 4 vane Moroso I bought used 8 or 9 years ago and it's been great. It pulls around 10". Have the same pump on the Camaro and it's been on that car for nearly 20 years, but it's been rebuilt a couple of times.
Main seals put in the conventional way, low tension rings, etc.

I bought the Moroso after my 2nd Aerospace Components pump $h!t the bed. It would pull 7" at best w/ the regulator closed. Aerospace sucks. down

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax