well, is he trying to reduce pressure OR volume?
my GUESS would be pressure but i could be wrong
if it's pressure, don't get to excited, i've ran my MII rack (used) for many miles with a run-of-the-mill gm (not for r&p) pump.
if you're REALLY worried, grap a pump off an early omni (remember those POS?) or a mopar FWD wih a saginaw pump and use it....
some of you guys really make stuff complicated....