Holley guru's- need advice

I have an older Holley 4779-2 750 DP that was used on my uncle's 8 sec slingshot. Im trying to convert it back to stock to run on my 340 by rebuilding it and replacing the parts that came stock on a 4779 carb (jets, power valve, squirters, etc... I noticed the outer air bleeds appear to have been drilled out. Will this cause a problem when I go to tune it for my 340?? Can tuning the air/fuel mixture screws compensate for the larger air bleeds? Would I be better off just buying a new proform 750 main body, trying it the way it is, or drilling and tapping for screw in air bleeds?

Thanks for the advice!