Well, here’s some numbers for perspective......
572”, 14:1, .825” cam, 440-3x, 1150 carb, cnc365’s.

918 Peak hp at 6800, VE @ 6800 was still 107.5%.
Peak tq is occurring 100rpm higher than that 589 is making peak hp.

It’s the sum of all the parts.

If you want to make significantly more power, you either need way more efficiency and/or cubes...... and move the tq peak up the power band...... and have it fall off slower.

You’ve got low CR and a small cam..... with heads designed for high compression and a big cam.
The sum of that pile of parts is apparently about 700hp.

“If” I bought a carb for it, it would be a 4500........ with the understanding it might not do much of anything to the ET with the motor in its current configuration.
I’d only be making that purchase if making upgrades to the motor combo that could really benefit from a 4500 carb(cam & compression) were part of the long term plans.

However........ I wouldn’t buy anything til the car has been to the track a few times.