Optimum Fuel Pressure for Thermoquad

I need to dig my Blown '73 340 Duster out of hibernation to attend a friend's wedding on the 1st, so this is a bit of a rush to get everything perfect again.

At the end of summer I installed a set of 850 Thermoquads (in place of a pair of 750 AVS's), but didn't drive the car any more. The Pressure (8psi) was way too high and it was dumping fuel out everywhere on both Thermoquads.

I'm going to be borrowing the Adjustable Holley Regulator from my Cousin's Supercharged 318 Mazda RX-7 (or as we call it, the Mazdodge RX-318) to get my car running in time for the wedding. Rather than beat my head against the wall testing various pressures, I figured you guys would be able to give me a straight answer that would save me some unnecessary work.

What's the optimum pressure for a TQ (or in this case, a pair of TQ's)