You can buy a Holley conversion 4150 metering block for that Vacuum secondary so there is adjustability with the Jets. That might sure you, but the springs in the vacuum pump need to be tailored to your specifications also.
I can perform the secondary metering block conversion that also includes a redone "idle circuit" where you can have completer 4 CORNER IDLING adjustability. Just email me and let me know.
Another option is to switch to a 650 Double pumper and ditch the 750 3310
tpcracing76@hotmail.com