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What do the plugs look like? Are they black?
It gives me the thought that the primary jets are too big, it is running rich.
Give me the list number and I may be able to find the original jet size from a holley book.
Are you the original owner of this carb?
If it runs best with this size jet--at WOT, you may need to open the power valve channel restiction and reduce the jet size. Manytimes getting the jets a little lean really increases the throttle response. But you must pay attention to spark knock.

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360 9.37 comp h405p speed pro pistons, stock rods, new stock cast crank, mild port ede heads, mopar 273 ductile rockers, xe284 comp cam, ede air gap. 1" phenolic spacer 4 hole, 727 2800 stall, 8 3/4 3.91 suregrip. was running a 4150hp 750 mechanical but didn't have the throttle response. I switched to a 600 holley dp and had great throttle response but couldnt get it to idle.
I just switched back to the 750 to make sure it wasnt just my imagination and it idles sweet but bogs off idle?

I tried different jets in the 600 didnt make any difference. the primary's are drilled on both to get the transfer slots at a normal range.

On the hp I'm running 69 and 75 with a 4.5pv
68 and 74 seemed to be the best for the 600 wot plug color

oh the 750 I bought brand new the only thing that isn't stock is I tried messing with bigger squirters. it had 28 and 29 and i have 32's.

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timing is 13 base 32 full in at 2500

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xe284 comp cam,

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