That pump number used to be fine without a regulator, but I've noticed a number of posts here and at moparts where people are complaining about the cutoff pressure being higher since they started producing them again.
When we tested the Competition version, it's regulating spring resulted in 7.5 psi cutoff (which is why I was having occassional flooding problems). Of course having the filter perfectly flat didn't help.
Mechanical Fuel Delivery for Mopar LA Engines
As long fuel level is holding steady at least you can tinker with the tuning. It will be valid as long as the fuel is at that level.
I'll probably start a new thread on pressure gage setups when I get some pictures. I made my setup long before digital camaras. Mine was direct to a mechanical gage, which is why it gets mounted outside. Also easy to see on the cowl. To do this bent brake hard line to slip between the hood and the cowl. Easy to scratch up the paint doing this so it may not be for everyone. -3 AN hose connects the hardline to a T on the feed lines at the carb. An AN cap replaces it when not in use.
OTH, almost any pump is capable of keeping up. I was having problems with a Holley chrome pump, probably not even made anymore, AND what must have been problems in the original supply line where it went over the axle. There was a small rust spot there near the exhaust pipe. At the strip pressure would drop to zero, and it still had enough fuel in the bowls to make it through the quarter. MPH and time was a little off but not much. I could hear it too. Point here is don't sweat the pump's capacity. Do watch the max pressure. The Carter 'competition' pump helped but did not solve the problem (which was the line) and it created a new problem with its 7.5 pressure rating. Going over pressure is the worst when hot or when lifting from 3000 rpm because at the speed the pump is delivering much more fuel than at 900 rpm. (There's a link on my webpage to an explanation of how mechanical pumps regulate.)
