Supplemental electric fuel pump and regulator rec's

Do a fuel volume test.
the volume test will tell the tale. You need about half a pound per hp per hour. and fuel weighs about 6 pounds per gallon.
So then, if you really had 450 hp, you would need,
(450 x .5 pound )/6=37.5 gallons per hour.
your pump will need to supply 37.5gallons US/60minutes =.625 gallons per minute, and .625 gallonUS = 80oz.
See what your pump can suck thru that 5/16ths line.
Then do it again but; Open the doggone gascap.
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I had a high-lift 223@050 cam in an 11.3/1 360, with OOTB Edelbrocks, that by it's Trapspeed made 350 hp
But then I installed a bigger fuel line.............
BTW, I loved that cam. Mega torque

IMO
at WOT, the fuel doesn't actually get a chance to pickup much heat from the engine-mounted pump to the intake. ....... but it always starts out hot from idling around.
After that 223 cam dropped lobes, I installed the next bigger cam, 230@050,
Later, I cut a hole in my hood and fed the carb with fresh above the hood air. The car, by it's trapspeed, went to 430hp.
now, you and I both know that one size bigger cam, does not make 80 hp. So how much of that was due to the cold air, and/or how much was due to the 3/8ths fuel-line, is anybody's guess.
But, I can tell you that as soon as I cut that hole in the hood, I was able to upjet from 68/76s to 72/80s, both with the 230* cam.
I run the HO mechanical pump right out of the Direct-Connection catalog, and the line is 3/8ths from pump to the tank, no return line and a honking big EFI filter on the suction side, mounted just in front of the front spring perch on the passenger side. From there, I routed the line inside the frame rail, all the way to the pump. From the pump to the carb is one piece of 3/8ths line no filter, and no filters in the inlets. My thinking was that whatever might get thru the EFI filter, is gonna pass right on thru the engine. I modified the factory pick-up to 3/8ths and installed the matching sock.
This set-up has no percolation issues, and, I run the coolant at a minimum 205*F. The pump and lines were new in about 2002. and the hole in the hood was about 2004 or 05. I'm sorta guessing.
You be the judge.