I think one .060 washer will raise the bypass pressure up to over 100 Lbs. at idle cold on a high volume pump with the high pressure black spring
It has been a long, long time since I tried adding pressure to those pumps, I usually cut one to two coils off the black springs to get 10 Lbs. per 1000 RPM with hot oil over 160 F
I think Mellings and Speed Pro are now, for the last two or two and half years, installing standard pressure springs in there high volume pumps instead of the high pressure springs, maybe not

That looks like the ticket.

To my knowledge all 66-71 Hemis came stock with the so called high volumn pump, same one that comes over the counter now. Actually there are two stock pumps, one for b motors (thin) and Hemi (thick). There are some good aftermarket pumps that will feed a monster engine. If your engine ran perfect I'd still pull apart to inspect, like one guy said Hemi = $$$$$

Do you have any idea as to what era crate hemi it is? The Cummins motors are the worst.

hemi's came with the standard length rotors. there were two pressure relief springs; the black 65lb street hemi and plain (no color) 75lb race hemi. the Ramchargers marketed a tall rotor with a spacer back in the '60's that fit in a stock pump housing. pretty sure the tall rotors that we all think of as high volume were actually Ford FE rotors.

that adjuster is worth every dime of it,, love mine.

back in the day we used to drill and tap the relief spring cap for 3/8"-24 and use a set screw with a jam nut to adjust pressure. fairly simple and cheap.