OK here's what the Gonkulator thinks:
With 2x450 LoRiser:
Torq 538 at 3800
Powr 470 at 5400
The cam is pretty far advanced at 7 Advance (113-106). Retarded to 3 Advance (110 ICL if you're into that) Gonks to
Torq 542 at 3900 +4
Powr 482 at 5500 +12
With 800 Holley & RPM:
7 Advance
Torq 555 at 3900
Powr 481 at 5300
3 Advance
Torq 559 at 4000
Powr 493 at 5400
The difference in the intakes is maybe a tenth and a MPH, hard to even notice off the clock, so depends on what parts you already have, and how much you like to babysit 4 bowls of Holley. All those effing o-rings.
Another advantage of the single quad is you can plop a gas mileage carb on there if you have a long trip, then swap it over to the big double-pumper in the parking lot so the rig looks more mean at the car show (or runs better at the strip).
The cam advance thing is free (gaskets), easy to try. Maybe if you had a really tight converter that much advance might work, but I think it's too much if you want to get up and run.